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Discussion :: Time and Work

  1. A can do a job in 30 days. B alone can do the same job in 20 days. If A starts the work and joined by B after 10 days, in how many days the job will be done?
    2. A.
    15 days
    B.
    16 days
    C.
    17 days
    D.
    18 days

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    Answer : Option D

    Explanation :

    A's one day work =Apti Time and work 71

    A's ten-day work =Apti Time and work 72

    So the remaining work would be =Apti Time and work 73

    B's one day work =Apti Time and work 74

    A and B's one day work =Apti Time and work 75

    Apti Time and work 76of the job will be done by them in one day.

    So, the remaining jobApti Time and work 77= 8 days

    Therefore, the total number of days required to do the job would be = 10 + 8 = 18 days

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