400m. / 60s =6.66 m/s
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400 meters per minute is about 1/4 mile per minute.
400 * 5 *60 / 1000 so 120 km/h.
in terms of speed, 10 mph. in terms of 400 splits, 1:30 for each 400.
It depends on his/her age and how fast is he/she.
400 meters = about 1,312.34 feet.