Q. A completes a work in 21 days while B completes it in 28 days. Their combined time is:
✅ Correct Answer: (B)
12 days
Explanation: Combined rate = 1/21 + 1/28 = 1/12. Hence time = 12 days.
Explanation by: Deepak Sahoo
Combined rate = 1/21 + 1/28 = 1/12. Hence time = 12 days.