The idea is to divide the distance by the time. In this case, that will give you miles per minutes.If you want miles per hours, one way to do this is to first convert the minutes to hours, then do the division (once again, distance divided by time).
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You need to run at an average speed of 15 mph.
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.
If 15 MPH is 4 minutes, an estimate would be about 8 minutes, half the speed and double the time.
8.5 minutes