A, B and C can do a work in 5 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work? Choose the correct choice.
A) 2 22/49  B) 2 2/49  C) 2 2/0  D) 2 2/2  E) 2 2/19
Work done by all three of them in one day = 1/5 + 1/8 + 1/12 = 49/120.   The number of days required = 120/49 = 2 22/49 days.   2 22/49nswer:2 22/49
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A, B and C can do a work in 5 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work?