How many miles per hour are you runnning if you ran 10 miles in 10 minutes?

Average speed is: (distance covered) divided by (time to cover the distance)

Your speed is exactly 10 miles per 10 minutes.

To get it in other units that sound more familiar, notice that

10 miles in 10 minutes is 1 mile per minute.

There are 60 minutes in 1 hour, so you would be able to cover

60 miles in that time.

10 miles/10minutes = 60 mph.