Yes, because a good walk is about 5 mph.
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You need to run at an average speed of 15 mph.
8mph
9 mph for 1 hour and 40 minutes is 15 miles. 1 hour at 9 mph = 9 miles 40 minutes at 9mph = 6 miles 9 miles + 6 miles = 15 miles
If 15 MPH is 4 minutes, an estimate would be about 8 minutes, half the speed and double the time.
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!