Question

A city water supply tank has two inlet pipes X, and Y which can fill it in 20 hrs and 30 hrs respectively, and an outlet pipe Z which can empty a full tank in 40 hrs. If the tank is empty and the taps are opened in succession for one hour each, and the process contains, in how many hours will the tank get filled?

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

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