[aptitude q] std table _ application in train man bridge, time and work problems - mrunal
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men and work by murnal.orgTRANSCRIPT
7/18/2019 [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-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
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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
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
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)
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7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal
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Gs
Hi mrunal, should it not be 54 km/hr in first question??
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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
7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal
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Mrunal (http://mrunal.org)
corrected. thanks
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Vikas
Sir
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Thanks
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mandeep singh
sir , in your approach ‘when train crosses the man’ shouldn’t it come
‘length of train+ width of man’ ?
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shivesh
Hi Mrunal , will u plzz tell how to prepare for general awareness section
of sbi po .with regards,
Shivesh
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CARMthnks
plz keep going on wid aptitude nd maths.
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shrikant
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good work mrunal…keep going.
will alwys need ur help…thankyou from everyone.
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shrikant
good work mrunal…keep going.thankyou from everyone.
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madhusir there are no options to download this chapter. it would be great if you
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My math is very poor I need your help sir Please!
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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.
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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 )
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.
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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 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
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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
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 = 6 9 9 2 4 # R E S P O ND )
BEEMA BASHEER
kindly provide practice problems
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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 = 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
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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 = 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
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?
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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
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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 = 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
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yearbook.html/comment-page-1#comment-340696)
DEVENDER { Mrunal, what about may, June current affairs series?? } – [Economy Lecture]
GS2: UNFCCC Lima Summit, Paris Summit Post-2020... (http://mrunal.org/2015/06/economy
lecture-paris-summit-post-2020-climate-finance-framework.html/comment-page-
1#comment-340678)
ABHISHEK { now how many lecture still remain to complete the economic lecture. sir please
discuss } – [Economy Lecture] GS2: UNFCCC Lima Summit, Paris Summit Post-2020...
(http://mrunal.org/2015/06/economy-lecture-paris-summit-post-2020-climate-finance-
framework.html/comment-page-1#comment-340641)
ISHU { THANKUUUUUU..SO MUCH SIR.. my economics was not so good and i have fear for that
but after listening to ur lectures all doubts are clear.... } – [Economy Lecture] GS2: UNFCCC Lima
Summit, Paris Summit Post-2020... (http://mrunal.org/2015/06/economy-lecture-paris-
summit-post-2020-climate-finance-framework.html/comment-page-1#comment-340627)
DWARIKA { in composition of the interior of the earth need updation in part of crust property
you are mentioned potassium is lowest in earth's crust ,... } – [Geography Lecture1] Longitude,Latitude, Timezones, Earth Interior, Rock types,... (http://mrunal.org/2015/02/youtube-
geography-l1-longitude-latitude.html/comment-page-2#comment-340620)
ANN { Thanks for the MCQs on IYB :) } – [Mock Test #3] India Yearbook Chapter 1 to 12:...
(http://mrunal.org/2015/06/upsc-mock-test-paper-1-india-yearbook.html/comment-page-
1#comment-340565)
RAVIRAJ DODIYA { Sir, I want to appear UPSC in Gujarati.Because I think I am comfortable
18 Days : CAPF-15
46 Days : SSC CGL15
60 Days : CSAT-15
101 Days : IBPS-PO-15
164 : IBPS-Clerk-15
177 Days : Mains-15
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 16/22
in that language and I can write 10 time better that any... } – [Analysis] Essay topic trends in last
19 years (1993-2011)... (http://mrunal.org/2011/12/analysis-essay-topic-trends-in-last-
19.html/comment-page-1#comment-340560)
VIMAL { product of two number is 600.Lcm of thease number 10.What is the HCF of those two
number? } – [Aptitude] LCM, HCF, GCD: Basic concept, calculation, applications explained
(http://mrunal.org/2013/03/aptitude-lcm-hcf-gcd-basic-concept-calculation-applications-
explained.html/comment-page-2#comment-340559)
HARSHAD NARKAR { What is your Message? Search before asking questions & confine
discussions to exams related matter only. sir,history lectures kab honge. } – [Economy Lecture]
GS2: UNFCCC Lima Summit, Paris Summit Post-2020... (http://mrunal.org/2015/06/economy
lecture-paris-summit-post-2020-climate-finance-framework.html/comment-page-
1#comment-340552)
JOHNS SWARGIARY { ist true that double the money plz ans me } – [Financial Inclusion]Kisan Vikas Patra (KVP): Features, Money Laundering,... (http://mrunal.org/2014/12/kisan-
vikas-patra-kvp-features-money-laundering-black-money-tax-benefit.html/comment-page-
1#comment-340548)
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7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal
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7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal
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1. Online Form Part-I stops few days before deadline, so don't wait till last date. Dont forget
reg.id & roll no.Note'em in Google Drive (https://www.google.com/drive/)
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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TENTATIVE NOTIFICATIONS
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7/18/2019 [Aptitude Q] STD Table _ Application in Train Man Bridge, Time and Work Problems - Mrunal
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