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    Question

    Two pipes P1 and P2 can fill a cistern in 12 minutes and

    15 minutes respectively. These pipes are opened alternately for 1 minute each, beginning with pipe P1. In what time will the cistern be full?
    A 13 min 20 seconds Correct Answer Incorrect Answer
    B 12 min 30 seconds Correct Answer Incorrect Answer
    C 10 min 20 seconds Correct Answer Incorrect Answer
    D 11 min 15 seconds Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

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