SOLUTION: Mary can clean a house in 6 hours, while John can clean a house in 4 hours. How much time will it take them if they clean it together?

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Question 182210: Mary can clean a house in 6 hours, while John can clean a house in 4 hours. How much time will it take them if they clean it together?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
(6*4)/(6+4)=24/10=2.4 hrs. when they clean together.