A, B and C can do a work in 6 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work?	Choose the correct option
A) 2 2/3 days	B) 2 6/3 days	C) 2 2/7 days	D) 6 2/3 days	E) 2 8/3 days
Work done by all three of them in one day   = 1/6 + 1/8 + 1/12 = 3/8.   The number of days required   = 8/3   = 2 2/3 days   2 2/3 daysnswer:2 2/3 days
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A, B and C can do a work in 6 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work?