SOLUTION: jack can clean the house in 12 hours, sam can do the same job in 9 hours. How long would it take if they worked together?
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Question 881635: jack can clean the house in 12 hours, sam can do the same job in 9 hours. How long would it take if they worked together?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
3x + 4x = 36
7x = 36
x = 36/7= 5 1/7 hr
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