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    Question

    A can copy 60 pages in 15 hours, A and B together can

    copy 126 pages in 21 hours. Then in how many hours B can copy 12 pages.
    A 24 hours Correct Answer Incorrect Answer
    B 21 hours Correct Answer Incorrect Answer
    C 22 hours Correct Answer Incorrect Answer
    D 26 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Number of pages copied by x in hour = 60/15 = 4
    Number of pages copied by x and y in 1 hour = 126/21 = 6
    ∴ Number of pages copied by y in 1 hour = 6 – 4 = 2
    ∴ Required time = 2 x 12 = 24 hours.

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