You must average 10 mph for the race to achieve a 9 minute time.
8 mph
She can run 3.75 miles in 15 minutes.
If it takes 4 minutes to run 1 mile then in 15 times as long (1 hour) you would run 15 miles. So the average speed must be 15 miles per hour.
4 (four) miles
speed = distance/time 15 minutes = 1/4 hour 1.5/1/4 = 6 mph
Athletes will run a mile in between 4 and 5 minutes. This is 12 to 15 miles per hour.
1.875 MILES IN 15 MINUTES
10 miles.
Six
She can run 3.75 miles in 15 minutes.
She can run 18.75 miles in 15 minutes at that pace. This, however, is humanly impossible since she would have to run at 75 mph!
It is 40 mph