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Discussion :: Time and Work

  1. A is twice as fast as B. If B alone can do a piece of work in 30 days, in what time can A and B together complete the work?
    2. A.
    10
    B.
    12
    C.
    15
    D.
    8
    E.
    None of these

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    Workspace

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    Answer : Option A

    Explanation :

    A can do the work in 30/2 i.e., 15 days.

    A and B's one day's work = 1/15 + 1/30 = (2 + 1)/30 = 1/10

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