You need to run at an average speed of 15 mph.
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1 mile is 0.62 kilometers 480 (8 minutes in seconds) multiplied by .62 = 297.6 seconds 297.6 seconds = 4 minutes, 57.6 seconds
If you run a mile in 4 minutes and 32 seconds, you average 13.235 miles per hour.
8.5 minutes
1 7/8
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!