A, B and C can do a work in 4 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work? Choose the correct answer.
A) 2 2/3  B) 2 2/8  C) 2 2/0  D) 2 2/2  E) 2 2/11
Work done by all three of them in one day = 1/4 + 1/8 + 1/12 = 11/24   The number of days required = 24/11 = 2 2/11 days.   Answer:2 2/11
<result>E</result>
A, B and C can do a work in 4 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work?