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Discussion :: Time and Work

  1. X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last?
    2. A.
    6 days
    B.
    10 days
    C.
    15 days
    D.
    20 days

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    Workspace

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    Answer : Option B

    Explanation :

    Work done by X in 4 days = (1/20 * 4) = 1/5

    Remaining work = (1 - 1/5) = 4/5

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