It needs to be a consistent 1:30 per 400m. I tried and I always come out 19 seconds slower... PB 6:19 12 years old 5'4 98 pounds
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1 mile in 4 minutes = 15 miles per hour
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.