Mathematics · Pipes and Cisterns

A pipe can fill a tank in 6 hours. Another pipe can empty the filled tank in 42 hours. If both pipes are opened simultaneously, in how many hours will the tank be completely filled?

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A pipe can fill a tank in 6 hours. Another pipe can empty the filled tank in 42 hours. If both pipes are opened simultaneously, in how many hours will the tank be completely filled?

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A pipe can fill a tank in 6 hours. Another pipe can empty the filled tank in 42 hours. If both pipes are opened simultaneously, in how many hours will the tank be completely filled?

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