Question

Sally can paint a room in 4 hours while it takes Steve 3 hours to paint the same room. How long would it take them to paint the room if they worked together?

Answer 1

The answer should be 3.5 hours

Answer 2

1/4hr + 1/3hr = 1/x

You multiply each term by 12x so all the denominators = 1 .

4x + 3x = 12
7x = 12
x = 1.71

Therefore, it will take 7/12 hours ( approx. 1.71 hours) to paint the entire room together.