SOLUTION: ben can paint a face in 3 hours and billy takes 4. How many hours will it take them to painting together?

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Question 314486: ben can paint a face in 3 hours and billy takes 4. How many hours will it take them to painting together?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
ben can paint a face in 3 hours and billy takes 4. How many hours will it take them to painting together?
.
Let x = time it takes for them to paint it together
then
x(1/3 + 1/4) = 1
x(4 + 3) = 12
7x = 12
x = 12/7 hours
or
x = 1 hour and 43 minutes