Each inlet pipe can fill an empty cistern in 84 hours while each drain pipe can empty the same cistern from a filled con…
Q1
Each inlet pipe can fill an empty cistern in 84 hours while each drain pipe can empty the same cistern from a filled condition in 105 hours. When the cistern is empty, 9 inlet pipes and 10 outlet pipes are simultaneously opened. After how many hours will the cistern be completely filled?
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