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    Question

    A can copy 80 pages in 20 hours, A and B together can

    copy 243 pages in 54 hours. Then in how many hours B can copy 60 pages.
    A 30 hours Correct Answer Incorrect Answer
    B 15 hours Correct Answer Incorrect Answer
    C 20 hours Correct Answer Incorrect Answer
    D 36 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Number of pages copied by x in hour = 80/20 = 4
    Number of pages copied by x and y in 1 hour = 243/54 = 4.5
    ∴ Number of pages copied by y in 1 hour = 4.5 – 4 = 0.5
    ∴ Required time = 0.5 x 60 = 30 hours

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