pipes and Cisterns

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Pipes A and B can fill a cistern in 10 and 12 hours respectively and pipe C can empty it in 6 hours. If all the three are opened simultaneously, then how much time is required for the tank to be full?

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Pipes & Cisterns Admin 2 years 2 Answers 467 views 0

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    (1/10)+(1/12)-(1/6) = 1/60
    i.e 60 hours

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    ans = 60 hr

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