Which of the following is the most appropriate unit to describe the rate at which water flows out through a standard household faucet?. . -Minutes per gallon, because the independent quantity is volume of water in gallons and dependent quantity is time in minutes.. . -Gallons per minute, because the independent quantity is volume of water in gallons and dependent quantity is time in minutes.. . -Minutes per gallon, because the independent quantity is time in minutes and dependent quantity is volume of water in gallons.. . -Gallons per minute, because the independent quantity is time in minutes