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Discussion :: Time and Work

  1. A can do a price of work in 30days while B can do it in 40 days. In how many days can A and B working together do it?
    2. A.
    70 Days
    B.
    42 ¾ days
    C.
    27 1/7 days
    D.
    17 1/7 days

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    Workspace

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    Answer : Option D

    Explanation :

    (A +B)'s 1 day's work = (1/30 + 1/40) = 7/120 


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