If you ran 10 miles in 30 minutes, you averaged 20 miles per hour. You covered the 10 miles in half an hour, so double the time and the distance, and you'll get 20 miles in 1 hour, or a 20 mph average.
7mph
6.4mph
11/2 miles in 15 minutes = 6 mph
5.68 miles per hour.
Running one mile in nine minutes is running at 6.66 miles per hour.
7mph
You are running 9 miles per hour.
6.4mph
11/2 miles in 15 minutes = 6 mph
Three and half miles per 23 minutes. ;)
5.68 miles per hour.
Running one mile in nine minutes is running at 6.66 miles per hour.
If you run at 10 miles per hour for 25 minutes you will have covered 4.167 miles.
5.36 Miles per hour
4 mph
131/3 mph
Your average speed is 6.6 miles per hour.