Q. Two pipes can fill a tank in 12 hours and 18 hours respectively. An outlet pipe can empty the tank in 36 hours. How long will the tank take to fill?
✅ Correct Answer: (C)
12 hours
Explanation: Net rate = 1/12 + 1/18 − 1/36 = 1/12.
Explanation by: Hriday
Net rate = 1/12 + 1/18 − 1/36 = 1/12.