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    Ram can copy 60 pages in 15 hours. If Ram and Riya together can copy 180 pages in 30 hours, then in how many hours can Riya copy 20 pages?
    Question

    Ram can copy 60 pages in 15 hours. If Ram and Riya together can copy 180 pages in 30 hours, then in how many hours can Riya copy 20 pages?

    A.

    29 hours

    B.

    12 hours

    C.

    20 hours

    D.

    10 hours

    Correct option is D

    Given:
    Ram can copy 60 pages in 15 hours.
    Ram and Riya together can copy 180 pages in 30 hours.
    Formula Used:
    Work rate formula: Rate of work=Total workTotal time\text{Rate of work} = \frac{\text{Total work}}{\text{Total time}}  ​
    The work done by both Ram and Riya together is the sum of their individual rates of work.
    Solution:

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