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OpenStudy (anonymous):
Joan can wax her car in 4 hours. when she works together with jan, they wax the car in 15 minutes. how long would it take jan, working by herself, t wax the car?
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OpenStudy (anonymous):
so if it takes both of them 4+ hours how do they get in done in 15 minutes?
OpenStudy (anonymous):
oh ok
OpenStudy (anonymous):
its 4/15
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