Answer: 72 miles per gallons
Explanation:
Hi, to answer this question we have to calculate the unit rate.
So, we simply have to divide the number of miles (1080) by the number of gallons (15).
Mathematically speaking:
1080 miles / 15 gallons = 72 miles per gallons
72 miles per gallons is the unit rate.
Feel free to ask for more if needed or if you did not understand something.