Question

Roland and Sam wash dogs to make extra money Rollin can wash all the dogs in 4 hours Sam can wash all the dogs in 3 hours how long will it take them to wash all the dogs if they work together

Answer 1

Make a chart such as the one I made to organize it, then follow the steps I used.

Answer 2

`1(5)/(7)\text{ days}`

Explanation:

Given,

Rollin can wash all the dogs in 4 hours,

The work done by Rollin in one day =
`(1)/(4)`

Also, Sam can wash all the dogs in 3 hours,

The work done by Sam in one day =
`(1)/(3)`

The total work done by both Rollin and Sam in one day =
`(1)/(4)+(1)/(3)=(3+4)/(12)=(7)/(12)`

Hence, the time taken by them when they work together =
`(1)/(7/12)=(12)/(7)=1(5)/(7)\text{ days}`