SOLUTION: Martha can rake the leaves in 3 hours. Her brother takes 7 hours. How long will it take if they work together?
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Question 889890: Martha can rake the leaves in 3 hours. Her brother takes 7 hours. How long will it take if they work together?
Answer by harpazo(655) (Show Source): You can put this solution on YOUR website!
Here is your equation:
1/3 + 1/7 = 1/x
Solve for x to find your answer.
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