Work done by all three of them in one day = 1/8 + 1/8 + 1/12 = 1/3
The number of days required = 3 days.
A, B and C can do a work in 8 days, 8 days and 12 days respectively. In how many days can all three of them working together, complete the work?

1) 3
2) 2 2/8
3) 2 2/0
4) 2 2/2
5) 2 2/1