Sally can paint a room in 4 hours while it takes Steve 6 hou

Sally can paint a room in 4 hours while it takes Steve 6 hours to paint the same room. How long would it take them to paint the room if they worked together?

Solution

sally jobs: 1/4

steve jobs: 1/6

together: 1/x

1/4+1/6=1/x

(5/12)=1/x

5x=12

x=12/5

12/5=2.4

0.4hours(60min/1hour)=24min