To find the unit rate of miles per gallon for the car, you would divide the total miles traveled by the total gallons of gas used.
Given:
- Distance traveled = 300 miles
- Gallons of gas used = 15 gallons
Unit rate = Distance / Gallons = 300 miles / 15 gallons = 20 miles per gallon.
Therefore, the ratio of the two measurements is 20 miles per gallon.