SOLUTION: If Sally can paint a house in 4 hours and Johan can paint the same house in 6 hours, how long will it take for both of them to paint the house together?

Question 348319: If Sally can paint a house in 4 hours and Johan can paint the same house in 6 hours, how long will it take for both of them to paint the house together?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
1/4+1/6=1/x
(6+4)/4*6=1/x
10/24=1/x cross multiply.
10x=24
x=24/10
x=2.4 hours to complete the painting working together.