Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is?
Q1. Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is?
Answer: 120 gallons
Explanation: Setting up the equation for 15-minute fill time with both inlet pipes and waste pipe gives a waste rate of 1/40 tank per minute = 3 gallons/min, so capacity = 120 gallons.