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Asked by vincent

Mary can clean the house in 6 hours. Her younger sister Ruth can do the same job in 9 hours. In how many hours can they do the job if they work together?
12 years ago

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Answered by MathMate
Use
time = 1/(1/M+1/R)
12 years ago
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Mary can clean the house in 6 hours. Her younger sister Ruth can do the same job in 9 hours. In how many hours can they do the job if they work together?

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