Q. Three pipes A, B and C can fill a tank in 12, 15 and 20 hours respectively. How long will they take together?
✅ Correct Answer: (A)
4 hours
Explanation: 1/12 + 1/15 + 1/20 = 1/4.
Explanation by: Kanak Sharma
1/12 + 1/15 + 1/20 = 1/4.