SOLUTION: Tom can clean the house in 30 minutes. His sister Sally takes 40 minutes to clean the house. If their mother joins them they can clean the house in 15 minutes. How much time the mo
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Question 1149581: Tom can clean the house in 30 minutes. His sister Sally takes 40 minutes to clean the house. If their mother joins them they can clean the house in 15 minutes. How much time the mother will take if she works alone? Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! Tom can clean the house in 30 minutes. His sister Sally takes 40 minutes to clean the house. If their mother joins them they can clean the house in 15 minutes. How much time the mother will take if she works alone?
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1/30 + 1/40 + 1/m = 1/15
