Question

Tommy can lay a brick walkway by himself in 12 hours. Robert does the same job in 10 hours.

Working together, how long will it take them to lay the brick walkway?
PLEASE HELP I NEED ASAP.

Answer 1

5 5/11 hours

Explanation:

So, there is a trick to doing this.

You would first need to get their work rate into the same measurements.

That's why we will find out how much they each work in one hour.

Tommy does 1/12 of the work in one hour while Robert does 1/10.

Here we can add them both up to make 11/60.

They finish 11/60 of the work in one hour.

They finish the job in 5 5/11 hours.