A car goes 420 miles on a 10 gallon tank. What is the unit rate of miles per gallon?

To find the unit rate of miles per gallon, you can divide the total number of miles by the total number of gallons.

Given:

• Miles traveled = 420 miles
• Gallons used = 10 gallons

The calculation is as follows:

\[ \text{Miles per gallon} = \frac{\text{Miles}}{\text{Gallons}} = \frac{420 \text{ miles}}{10 \text{ gallons}} = 42 \text{ miles per gallon} \]

Thus, the unit rate is 42 miles per gallon.