Rate of flow of water in the fish tank will be given by: rate=volume/time the rate of our tank is 15 gallons every 10 minutes. Thus, rate=15/10=1.5 gallons/ minute Therefore time taken for the tank to overflow will be: time=volume×rate volume of the tank=315 gallons rate=1.5 gallons per minute hence: time=315×1.5 =472.5 minutes =7 7/8 hours=7.875 hours
