Bhanu Chaudhary
Poll
Professional
Asked: 2022-03-04T13:13:35+05:30

Pipe A can fill a tank in 40 minutes. Pipe B whose diameter is twice as that of Pipe A also fills the tank. lf both the pipes are opened together when the tank is 3/4ths empty, when will the tank be full?

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Pipe A can fill a tank in 40 minutes. Pipe B whose diameter is twice as that of Pipe A also fills the tank. lf both the pipes are opened together when the tank is 3/4ths empty, when will the tank be full?

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    1 Answer

    1. Professional

      Correct Answer: 6 minutes

      The ratio of the diameters of Pipe A and Pipe B is 1 : 2.

      Therefore, the ratio of the rate of flow of water through A and B is 1 : 4

      And the ratio of the time for Pipe A and Pipe B to fill a given capacity is 4 : 1.

      If Pipe A can fill the tank in 40 minutes, then Pipe B will fill it in 10 minutes.

      Together, the two pipes can fill 1/40+1/10=1+4/10=1/8th of tank in a minute.

      They will take 8 minutes to fill tank.

      Hence, to fill 34th of the tank, the two pipes will take 3/4×8 = 6minutes.

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