The best interpretation of R'3 is the rate at which the water leaks from the tank, in gallons per hour, three hours after the leak is discovered.
In the United States, a gallon is a unit of volume.
Here, the water leak is measured in gallons per hour. So, for the first hour, the interpretation would be R1.
For the second hour, it would be R2 and so for the third hour, it will be R3.
Thus, the correct option is C, the rate at which the water leaks from the tank, in gallons per hour, three hours after the leak is discovered.
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