Question

Sally can paint a room in 5 hours while it takes steve 7 hours. How long would it take them together?

Answer 1

2.92 or 35/12

Explanation:

Each hour sally does 1/5 and Steve does 1/7 1/5+1/7=12/35

each hour they do 12/35

So divide 1 by 12/35 to find how long it takes and you get

35/12 or ≈2.92