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    Question

    A can copy 70 pages in 25 hours, A and B together can

    copy 135 pages in 25 hours. Then in how many hours B can copy 10 pages.
    A 20 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 = 70/25 = 2.8
    Number of pages copied by x and y in 1 hour = 135/25 = 5.4
    ∴ Number of pages copied by y in 1 hour = 5.4 – 2.8 = 2.6
    ∴ Required time = 2.6 x 10 = 26 hours.

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