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.
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?
1. 2 2/3
2. 2 2/8
3. 2 2/0
4. 2 2/2
5. 2 2/11