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8 November, 13:25

One person can do a certain job in six days, a second person can do the same job in two days, and a third person can do this job in three days. how many days will they take to do the job together?

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  1. 8 November, 13:41
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    First find their rates ...

    1/6, 1/2, and 1/3 now combined they will perform the job in one day if:

    t/6+t/2+t/3=1 make all have a common denominator

    t/6+3t/6+2t/6=6/6 which is equal to:

    6t=6 so

    t=1

    So if they all work together they will complete the job in one day.
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