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    Question

    A can copy 70 pages in 20 hours, A and B together can

    copy 135 pages in 30 hours. Then in how many hours B can copy 15 pages.
    A 18 hours Correct Answer Incorrect Answer
    B 15 hours Correct Answer Incorrect Answer
    C 10 hours Correct Answer Incorrect Answer
    D 16 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Number of pages copied by x in hour = 70/20 = 3.5
    Number of pages copied by x and y in 1 hour = 135/30 = 4.5
    ∴ Number of pages copied by y in 1 hour = 4.5 – 3.5 = 1
    ∴ Required time = 1 x 15 = 15 hours

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