A tank drains at a rate of 5 gallons per minute. How long will it take to empty 600 gallons?

To find out how long it takes to empty the tank, you need to divide the total volume of the tank by the rate at which it drains. In this case, the tank contains 600 gallons, and it drains at a rate of 5 gallons per minute.

You perform the calculation as follows:

600 gallons / 5 gallons per minute = 120 minutes.

This calculation shows that it will take 120 minutes to completely drain the tank of 600 gallons at the given rate. Thus, the choice indicating 120 minutes accurately reflects the correct answer for the time needed to empty the tank.