Paul can install a 300-square-foot hardwood floor and 18 hours. matt can install the same floor and 22 hours. how long would it take paul and mat to install the floor working together?

To do answer this question you would take paul's time and divide it in half getting 9 hours then do the same for matt getting 11 then you add the two getting 20 hours and then divide that by two getting 10 hours  so all in all it would take matt and paul 10 hours to install the floor together 

Dcups i think