Concurrent Work Problems

problems. work word

solve to1 formula theUse b

t

a

t

t = time togethera = first individuals time b = second individuals time1 = the entire job

If Shelly can mow the yard in 3 hours and Kenny’s brother can mow the yard in 2 hours, how long will it take if they mow the lawn together ?

123

tt

632 tt

65 t

hours 5

11t

Wendy can build a clubhouse in 3 hours and Bebe can build a clubhouse in 4 hours, how long will it take if they build one clubhouse together?

143

tt

1234 tt

127 t

hours 7

51t

Shoveling Snow

After a heavy snowfall, Butters can shovel all of the driveway in 30 minutes. If Pip helps, the job takes only 20 minutes. How long would it take Pip to do the job by himself?

Shoveling Snow

After a heavy snowfall, Butters can shovel all of the driveway in 30 minutes. If Pip helps, the job takes only 20 minutes. How long would it take Pip to do the job by himself?

120

30

20

b

bb

b 30120

30

2030

bb 3060020

b10600

b60

Conclusions

• Pip’s rate was 60.

• If Pip shoveled the drive way by himself it would take 60 minutes or 1 Hour.

Work & Motion Word Problems