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Discussion :: Time and Work

  1. A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work?
    2. A.
    10 days
    B.
    11 days
    C.
    15 days
    D.
    20 days

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    Answer : Option C

    Explanation :

    B's 1 day work = (1/12 - 1/20) = 1/30

    Now, (A + B)'s 1 day work = (1/20 + 1/60) = 1/15

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