[aptitude q] std table _ application in train man bridge, time and work problems - mrunal

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 Aptitude (http://mrunal.org/category/aptitude) / 2 years Ago / 28 Comments (http://mrunal.org/2013/02/aptitude-q-std-table-application-in-train-man-bridge-ti Not really an article, just solving some readers’ queries to keep the STD concept refreshed. 1. Case: Train, Man and Bridge 1. Conversion : kmph vs ms 2. Finding length of train 2. Case: Time n Work : A and B Case: Train, Man and Bridge A man is standing on a 180m long bridge.He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the length of the train and its speed. Approach: When train crosses the bridge When train crosses the man Total distance= length of train + width of bridge length of t rain + width of bridge “m”+180 “m+0 Because in comparison to train, man / telephone wire / bike-rider etc are considered zero in width. Now make table Train + bridge Train + man Speed ssTime 20 8 [Aptitude Q] STD table : Application in train man bridge, time and work problems   English: SP Bakshi (http://www.flipk art.com/objecti ve-general- english-2012/p/itmdyuqqgafhtehp? pid=9788183480000&affid=mrunalrugm)   Mrunal (http://mrunal.org/)  

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Page 1: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

http://slidepdf.com/reader/full/aptitude-q-std-table-application-in-train-man-bridge-time-and-work-problems-56974cc442d46 1/22

Aptitude (http://mrunal.org/category/aptitude) / 2 years Ago

28 Comments (http://mrunal.org/2013/02/aptitude-q-std-table-application-in-train-man-bridg

Not really an article, just solving some readers’ queries to keep the STD concept refreshed.

1. Case: Train, Man and Bridge

1. Conversion : kmph vs ms

2. Finding length of train2. Case: Time n Work : A and B

Case: Train, Man and Bridge

A man is standing on a 180m long bridge.He finds that a train crosses the bridge in 20 second

but himself in 8 seconds. Find the length of the train and its speed.

Approach:

When train crosses the bridge When train crosses the man

Total distance=length of train + width of bridge length of train + width of bridge

“m”+180 “m”+0

Because in comparison to train, man / telephone wire / bike-rider etc are considered zero in

width.

Now make table

Train + bridge Train + man

Speed “s” “s”

Time 20 8

[Aptitude Q] STD table : Application in train man bridge, time and workproblems

English: SP Bakshi(http://www.flipkart.com/objective-general-

english-2012/p/itmdyuqqgafhtehp?pid=9788183480000&affid=mrunalrugm)

Mrunal (http://mrunal.org/)

Page 2: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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Distance M+180 M

Now apply STD formula and you get two equations

Train + bridge Train + man

Speed “s” “s”

Time 20 8

Distance M+180 M

Speed X time = Distance S x 20 = (M+180) S x 8 =M

ust solve those two equations

20s=M+180….(i)

8s=M….(ii)

So in first equation, replace the value of M=8s

20s=8s+180

20s-8s=180

12s=180

S=180/12S=15 m/s. that’s our final answer. But suppose, in the answer options, the speed is given in in

km/h, then you need to convert m/s into km/h.

Conversion : kmph vs ms

1km =1000 meters.

1 hr = 60 minutes = 60 x 60 seconds = 3600 seconds.

Therefore, 1 km / hr = 1000m / 3600 seconds

1km / hr = 5 / 18 (m/s)

n otherwords,

1 meter per second = 18 / 5 kmph.

So 15 (m/s) = 15 x (18/5) km/h = 54 kmph. That’s our final answer.

Finding length of train

Page 3: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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Moving to the next part: find the length of this train.

From the second equation, we know that

S x 8 =M

And we’ve found that speed of train= 15m/s.

hence 15 x 8 =m

m=120meters.

Answer: length of train is 120 meters.

Case: Time n Work : A and B

Question: A can do a piece of work in 80 days. He works at it for 10 days and then B alone

finishes the remaining work in 42 days. In how much time will A and B together finish the wor

Make table

A B

Speed a b

Time 80 b

Distance = speed x time a x 10=80a

t means total distance to be covered, is “80a”.

A works for 10 days

A B A works

Speed a b a

Time 80 10

Distance = speed x time a x 10=80a 10 x a =10a

See the last column. A covered distance of 10a, meaning

So 80a-10a=70a distance is yet to be covered.

Now B comes and finishes this in 42 days

Page 4: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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A B A works B finishes

Speed a b a b

Time 80 10 42

Distance = speed x

time

a x

10=80aa x 10 =10a. (meaning 70a remains). b x 42= 42

That means 42b=70a (because remaining work =70a and B finished this.)

b=(70/42)a

Therefore, b=5a/3

Now if A+B worked together then, we can add their speed. And together they’ve to finish 80a

distance

Update the table

A B A worksB

finishes

A+B

together

Speed a b=5a/3 a b a+5a/3=8a/

Time 80 10 42 T

Distance = speed

x time

a x

10=80a

a x 10 =10a. (so 70a work

remains).

b x 42=

42b80a

Apply STD in last column

Speed x time = distance

8a/3 x T =80a

Therefore T= 30 days.

Final answer: if A and B work together, it’ll take them 30 days to finish the job.

Tags: STDW (http://mrunal.org/tag/stdw)

  Mrunal recommends

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R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 0 5 1 # R E S P O ND )

Gs

Hi mrunal, should it not be 54 km/hr in first question??

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 0 9 0 # R E S P O ND )

sajan

CONVERTION KMPH VS MS:- Mrunal when u converted the speed of the

train from m/s to km/hr u committed a mistake. the answer should be

54km/hr :- 15m/s= 15×18/5km/hr =54km/hr

Page 7: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 1 0 1 # R E S P O ND )

Mrunal (http://mrunal.org)

corrected. thanks

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 1 9 4 # R E S P O ND )

chandu

sir, i find many of your articles worth saving!how can i download

them????

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W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 2 2 0 # R E S P O ND )

Vikas

Sir

Thanks for all the guidance and support you are providing to us. My

maths is improving day by day and i am able to solve sums faster than

what i used to do before.

I am going to take the SSC exam this year. If you can upload the SSC’s last

5-10 years paper, it will be beneficial to us.

Thanks

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 2 4 3 # R E S P O ND )

vikas

chandu for every article posted in mrunal . there is a link on right side

bottom corner of every which can be used to save the article as a PDF

file.

Page 8: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 3 2 3 # R E S P O ND )

mandeep singh

sir , in your approach ‘when train crosses the man’ shouldn’t it come

‘length of train+ width of man’ ?

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 3 6 1 # R E S P O ND )

shivesh

Hi Mrunal , will u plzz tell how to prepare for general awareness section

of sbi po .with regards,

Shivesh

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 4 4 6 # R E S P O ND )

CARMthnks

plz keep going on wid aptitude nd maths.

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 7 3 0 # R E S P O ND )

lovely jha

The best things in life is always FREE…/

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 7 8 8 # R E S P O ND )

shrikant

Page 9: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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good work mrunal…keep going.

will alwys need ur help…thankyou from everyone.

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 3 7 9 0 # R E S P O ND )

shrikant

good work mrunal…keep going.thankyou from everyone.

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 4 7 4 0 # R E S P O ND )

madhusir there are no options to download this chapter. it would be great if you

give the option for downloading it in pdf file.

  R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E -

A N D - W O R K - P R O BL E M S . H T M L ? RE P L Y T O C O M = 4 8 8 10 # R E S P O N D )

ashok gowda

After every article right corner there is a option called PDF/PRINT,

go to that and you find options on ur left side and give the

command to save as pdf you file will be saved in pdf.

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 3 5 5 2 2 # R E S P O ND )

Sunil

My math is very poor I need your help sir Please!

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

Page 10: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 4 4 8 7 3 # R E S P O ND )

Ramya

Sir, Thank you for your guidance. I have a doubt in the following

problem.

A train running at 54kmph takes 20sec to pass a platform. Next it takes

12 sec to pass a man walking at 6kmph in the same direction in which

the train is going. Find the length of the train and length of the platform.

First the relative speed is calculated since the train and man in the same

direction. (54-6 = 48). conversion = 40/3m/sec.

After that, I have doubt to proceed. Please guide me to proceed furtherin this problem.

  R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E -

A N D - W O R K - P R O BL E M S . H T M L ? RE P L Y T O C O M = 1 5 3 96 4 # R E S P O N D )

prateek badola

as in 1st qus…

whn train moves with 54km/h

1-length of train will be-108m

2-length of platform will be-192m

and next 1is…

the speed of goods train will be 62 km/h

it is not so difficult to solve train jst do more practice and don’t go

with formulas…basic method is always cool…..

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 4 4 8 7 5 # R E S P O ND )

Page 11: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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Ramya

Sir, I have one doubt in the following problem.

A man sitting in a train which is travelling at 50kmph observes that a

goods train, travelling in opposite direction, takes 9 sec to pass him. If 

the goods train is 280m long, find its speed.

I am confused here in calculating the relative speed and how to observe

the time taken to pass him. Please guide me to proceed.

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 4 5 5 4 1 # R E S P O ND )

Ramya

Sir, I have one doubt in the following problem.

A man sitting in a train which is travelling at 50kmph observes that a

goods train, travelling in opposite direction, takes 9 sec to pass him. If 

the goods train is 280m long, find its speed.

I am confused here in calculating the relative speed and how to observe

the time taken to pass him. Please guide me to proceed

  R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E -

A N D - W O R K - P R O BL E M S . H T M L ? RE P L Y T O C O M = 1 5 7 17 0 # R E S P O N D )

ritikdalal

in this we consider only length of of goods train .so total length

/a+b =time length=280m,a=50kmph=125/9metre per second ,let

speed of second train is b metre per second so 280/125/9+b

=9,b=280/9-125/9 =155/9=62 kmph

Page 12: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 6 9 9 2 4 # R E S P O ND )

BEEMA BASHEER

kindly provide practice problems

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 8 1 8 3 5 # R E S P O ND )

chetan

can’t we do m/8=(m+180)/20 to find the length of the train as speed in

both the cases is same

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 8 7 4 2 2 # R E S P O ND )

Shiv shankar

Whether this problem is right?

A man walking in fog @ 4kmph. A 20m long train overtakes him in 30

seconds and the man could see in the fog uptoa distance of 50m. Find

the speed of the train.

If right then please answer.

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 1 5 3 9 6 5 # R E S P ON D )

prateek badola

as in 1st qus…

whn train moves with 54km/h

1-length of train will be-108m

2-length of platform will be-192m

Page 13: [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal

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and next 1is…

the speed of goods train will be 62 km/h

it is not so difficult to solve train jst do more practice and don’t go with

formulas…basic method is always cool…..

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 1 5 7 1 4 3 # R E S P ON D )

aditi

how can i solve this question with help of STD method:-

3 pumps, working 8 hours a day, can empty a tank in 2 days. How manyhours a day must 4 pumps work to empty the tank in 1 day?

  R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E -

A N D - W O R K - P R O BL E M S . H T M L ? RE P L Y T O C O M = 1 5 7 16 3 # R E S P O N D )

ritikdalal

3*8*2=x*4*1 x=48/4=12hours per day

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 1 9 5 1 6 0 # R E S P ON D )

Tahir Ahmed Majid

Sir, kindly provide the solution for 2013 Pre STD problems by STD table &Product consistency method. I’m unable to arrive at solution by either

method. May be m putting values wrong. & sir also kindly provide more

Mock problems on STD specifically for solving. Thanks.

R E P L Y ( / 2 0 1 3 / 0 2 /A P T I T U D E - Q - S TD - T A B L E - A P P L IC A T I O N - I N- T R A I N - M A N -B R I D G E - T I M E - A ND -

W O R K - P R O B L E M S. H T M L ? R E P L Y TO C O M = 2 3 3 9 8 3 # R E S P ON D )

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sonal

thank you mrunal for the time consuming method… keep guiding us

Post Message

4 Days : CMS-15

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1. Online Form Part-I stops few days before deadline, so don't wait till last date. Dont forget

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2. I usually update vacancies every Monday.Purple link= newly added,Blue= existing.Last

updated Mon. Jun 22, at 9:04PM

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