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    Question

    Pipe A and B can fill the pool in 20 minutes and 24

    minutes, respectively. Pipe C can empty half filled pool in 20 minutes. If all the pipes are opened together, then find the time taken to fill the empty pool completely
    A 10 minutes Correct Answer Incorrect Answer
    B 11 minutes Correct Answer Incorrect Answer
    C 12 minutes Correct Answer Incorrect Answer
    D 15 minutes Correct Answer Incorrect Answer

    Solution

    Time taken by pipe C to empty the full pool = 20 ├Ч 2 = 40 minutes Let the capacity of pool = 120 units Number of units of water filled by pipe A alone in one minute = 120/20 = 6 units Number of units of water filled by pipe B alone in one minute = 120/24 = 5 units Number of units of water emptied by pipe C alone in one minute = 120/40 = 3 units Required time taken = 70/(6 + 5 тАУ 3) = 15 minutes

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