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    Question

    A cistern has two inlet pipes, A and B, which can fill

    it in 12 hours and 18 hours, respectively. There is also a drain pipe, C, that can empty the full cistern in 36 hours. If all three pipes are opened together, then how long will it take to fill the cistern?
    A 12 hours Correct Answer Incorrect Answer
    B 9 hours Correct Answer Incorrect Answer
    C 10 hours Correct Answer Incorrect Answer
    D 6 hours Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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