Question

Tom can mow a lawn in 4 hours. It takes Perry 5 hours to mow the same lawn. How long would it take both of them, working together, to mow the same lawn?

Answer 1

1/4 + 1/5 = 1/t

5/20 + 4/20 = 1/t

9/20 = 1/t

9t = 20*1

9t = 20

t = 20/9

So it will take them 20/9 hours, or 2 and 2/9 hours, to get the job done if they do it together.

Answer 2

thank you SO much!!!

Answer 3

np