Q. A and B together complete a work in 14 days. A alone can finish it in 21 days. In how many days can B alone do it?
✅ Correct Answer: (C)
42 days
Explanation: 1/14 - 1/21 = 1/42.
Explanation by: Yami Thakur
1/14 - 1/21 = 1/42.