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    Question

    Pipe A fills a tank in 10 hr, Pipe B in 15 hr, and Pipe

    C empties in 30 hr. All open together. Time to fill?
    A 6 hr 44 min Correct Answer Incorrect Answer
    B 2 hr 10 min Correct Answer Incorrect Answer
    C 7 hr 30 min Correct Answer Incorrect Answer
    D 1 hr 10 min Correct Answer Incorrect Answer

    Solution

    ATQ,

    → 1/10 + 1/15 – 1/30 = 2/15

    → Time = 15/2 = 7.5 hr = 7 hr 30 min

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