A, B and C can do a work in 9 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work? Answers.
A) 3 3/23
B) 3 3/28
C) 2 2/0
D) 2 2/2
E) 2 2/1
Work done by all three of them in one day = 1/9 + 1/8 + 1/12 = 23/72.   The number of days required = 72/23 = 3 3/23 days.   3 3/23nswer:3 3/23
<result>A</result>
A, B and C can do a work in 9 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work?