Answer:
The average speed is 8 miles per hour.
Explanation:
To figure this out, in this case, it will be easier to convert the fraction into a decimal. 2 1/2 is equivalent to 2.5. Then, to find the unit rate, divide both 20 and 2.5 by 2.5. 2.5 divided by 2.5 is 1, and 20/2.5 is 8. Therefore, you go 8 miles per hour. You can check this by multiply 8 by 2.5.