SOLUTION: David can paint a room in 5 hours. Patti can paint a room in 7 hours. How long will it take them to paint a room working together?
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Question 584129: David can paint a room in 5 hours. Patti can paint a room in 7 hours. How long will it take them to paint a room working together? Answer by richwmiller(17219) (Show Source):
