Robert can paint a certain wall in 8 minutes, while it takes jack 24 minutes to paint the same wall. how long will it take robert and jack to paint the wall working together?

6 minutes

You can get this by setting up the equation:

x/8 + x/24 = 1

Where x is equal to the amount of hours spent working. In this equation x/8 would be the first. In 8 hours he would paint on room. x/24 would be the second. When you add them together using common denominators, you can find x.