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    Question

    A can copy 65 pages in 13 hours, A and B together can

    copy 150 pages in 15 hours. Then in how many hours B can copy 10 pages.
    A 54 hours Correct Answer Incorrect Answer
    B 60 hours Correct Answer Incorrect Answer
    C 50 hours Correct Answer Incorrect Answer
    D 56 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Number of pages copied by x in hour = 65/13 = 5
    Number of pages copied by x and y in 1 hour = 150/15 = 10
    ∴ Number of pages copied by y in 1 hour = 10 – 5 = 5
    ∴ Required time = 5 x 10 = 50 hours

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