if chase runs 5 miles in 60 minutes how fat will he run in 3 hours if he continues to run at the same rate

If Chase runs 5 miles in 60 minutes, his speed is 5 miles per 60 minutes = 1 mile per 12 minutes.

Therefore, in 3 hours, which is equal to 3 hours x 60 minutes/hour = 180 minutes, he will run 1 mile per 12 minutes x 180 minutes = 15 miles. Answer: \boxed{15}.