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    Question

    Three pipes, A, B, C can fill an empty cistern in 2, 3

    and 6 hours respectively. They are opened together. After what time should B be closed, so that the cistern gets filled in exactly 1hr 15 min?
    A 30 min Correct Answer Incorrect Answer
    B 20 min Correct Answer Incorrect Answer
    C 45 min Correct Answer Incorrect Answer
    D 15 min Correct Answer Incorrect Answer

    Solution

    The correct answer is A

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