Q. A and B can complete a piece of work in 12 days. A alone can complete it in 20 days. In how many days can B alone complete the work?
✅ Correct Answer: (B)
30 days
Explanation: B's 1-day work = 1/12 - 1/20 = 1/30. Therefore, B alone takes 30 days.
Explanation by: Krishna Sharma
B's 1-day work = 1/12 - 1/20 = 1/30. Therefore, B alone takes 30 days.