In science class at school we had to do research about household daily water use and an average washing machine uses 55 gallons per load, unless you have a high efficiency model.
1 hour = 60 minutes 20 gallons / 1 minute = x gallons / 60 minutes Solve the equation for the amount of gallons per hour 60 min x 20 gallon / 1 = x x = 1200 gallons/minute