It works out as 15 miles per hour. Pace aside, four minutes is an extremely fast time for a mile. Anybody who runs that fast should drop whatever they are doing regerdless of priority and start their Olympic training. A 4 minute mile was prviously thought humanly impossible.
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1 mile in 8 minutes = 7.5 miles in 60 minutes ie 7.5 mph
The speed is 20 mph. 1 mile/3 minutes = 1/3 mile per minute (x 60 minutes/hour) = 20 miles/hour
twenty miles per hour 3 minutes = 1 mile 6 minutes = 2 miles 60 minutes = 20 miles
you would be running 120mph
To acheive a time of 13 minutes in one mile you have to walk at least 4.62 mph.