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    Question

    Pipe P and Q can fill a tank in 20 minutes and 30

    minutes individually. Another pipe R can empty the tank in 60 minutes. When all the three pipes are opened together then What will be the time taken by them to fill 75% of the capacity of the tank.
    A 12 minutes Correct Answer Incorrect Answer
    B 12.20 minutes Correct Answer Incorrect Answer
    C 10 minutes Correct Answer Incorrect Answer
    D 11.25 minutes Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, we can say that The capacity of the tank be = 60 units So, Part of the tank filled by P in 1 minute is = 3 unitsĀ  So, Part of the tank filled by Q in 1 minute = 2 unitsĀ  Therefore, Part of the tank emptied by R in 1 minute = 1 unitĀ  So, Part of the tank filled by P, Q and R in 1 minute = 4 units Hence, the Required timeĀ  will be = [(Ā¾)Ā  xĀ  60Ā  x (Ā¼)] = 11.25 minutes

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