Q. Two pipes A and B can fill a tank in 15 and 20 hours respectively. How long will they take together?
✅ Correct Answer: (C)
8 hours
Explanation: 1/15 + 1/20 = 7/60 → time = 60/7 ≈ 8 hours.
Explanation by: Kanak Sharma
1/15 + 1/20 = 7/60 → time = 60/7 ≈ 8 hours.