Question

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

    copy 135 pages in 27 hours. Then Y can copy 20 pages in
    A 20 hours Correct Answer Incorrect Answer
    B 21 hours Correct Answer Incorrect Answer
    C 22 hours Correct Answer Incorrect Answer
    D 25 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 = 135/27 = 5
    ∴ Number of pages copied by y in 1 hour = 5 – 4 = 1
    ∴ Required time = 20 hours.

    Practice Next