Question

    A can copy 60 pages in 20 hours, A and B together can

    copy 189 pages in 27 hours. Then in how many hours B can copy 12 pages.
    A 48 hours Correct Answer Incorrect Answer
    B 60 hours Correct Answer Incorrect Answer
    C 65 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 = 60/20 = 3
    Number of pages copied by x and y in 1 hour = 189/27 = 7
    ∴ Number of pages copied by y in 1 hour = 7 – 3 = 4
    ∴ Required time = 4 x 12 = 48 hours

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