Question

Sally can paint a room in 7 hours while it takes Steve 4 hours to paint the same room. How long would it take them to paint the room if they worked​ together?

Answer 1

The formula for this is
worker 1 * worker 2 / worker 1 + worker 2

7 * 4 / 7 + 4 =
28 / 11 =
2.54 hours