Answer:
10 miles per hour
Step-by-step explanation:
If he ran .4 miles each lap than multiply 1/4 by 10 for the distance.
.25mile x 10 = 2.5miles
2.5 miles in 15 minutes
15 minutes is 1/4 an hour so multiply both 2.5 miles and 15 minutes by 4
2.5miles x 4 = 10miles
15 x 4 = 60min
10 miles for 60 minutes or 10mph