A and B together can complete a piece of work in 35 days while A alone can complete the same work in 60 days. B alone will be able to complete the same working in

- 74 days
- 80 days
- 84 days
- 90 days

**Answer**

(A + B)’s one day work = 1/35

A’s one day work = 1/60

B’s one day’s work = (A + B)’s one days work - A’s one day’s work

1/35 - 1/60 = 1/84

**The correct option is C.**