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    Question

    Two taps would fill a cistern in 18 and 24 minutes

    respectively. Both tapsbeing opened find when the Ist tap must be turned off so that the cistern may be just filled in 12 minutes.
    A 9 min Correct Answer Incorrect Answer
    B 6 min Correct Answer Incorrect Answer
    C 3 min Correct Answer Incorrect Answer
    D 1 min Correct Answer Incorrect Answer

    Solution

    AB 1824 72 43 Work done by pipe B in 12 min = 3 ├Ч 12 = 36 Remaining work = 72-36 = 36 Time taken by pipe A = 36/4 = 9 min So, the Pipe should be closed after 9 min.

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