A, B and C can respectively complete a task alone in 26, 39 and 52 days. The trio started working together, but A and B both left 13 days before the task got over. For how many days did the three work together?
1
22
2
9
3
13
4
8
A, B and C can respectively complete a task alone in 26, 39 and 52 days. The trio started working together, but A and B both left 13 days before the task got over. For how many days did the three work together?