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OpenStudy (anonymous):
jack usually mows his lawn in 7 hours. Marilyn can mow the same yard in 3 hours. how much time would it take for them to mow the lawn together?
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hero (hero):
If I remember correctly you do \[\frac{M \times N}{M+N}\]
hero (hero):
so 21/10 = 2.1 hrs
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