You must run at a speed of exactly [ 1 mile per 13.5 minutes ].
To convert that to a more familiar unit:
1/13.5 (mile/minute) x (60 minute/hour) = 4 4/9 mile/hour
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10 mph
24.14 km per hour for a 4-minute mile.
0.25 miles a minute, an average of 15 mph......................................
You would have to run 60 ÷ 8 = 7.5 mph.
0.75(3/4) of a mile per minute