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    Question

    Pipe A fills a tank in 12 min, pipe B in 18 min. Time to

    fill together?
    A 17 mins 22 secs Correct Answer Incorrect Answer
    B 27 mins 12 secs Correct Answer Incorrect Answer
    C 7 mins 12 secs Correct Answer Incorrect Answer
    D 10 mins 5 secs Correct Answer Incorrect Answer

    Solution

    ATQ, Rate = 1/12 + 1/18 = (3+2)/36 = 5/36 tank/min Time = 36/5 = 7.2 min = 7 min 12 s

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