2 minutes 59 seconds.
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It depends on his/her age and how fast is he/she.
1 mile = 1609 meters 400 meters = 400/1609 miles ~ one fourth mile
.24
6 minutes and 8 seconds
At 1.25 seconds, it would take you 1.25 seconds, but I'd say that was rather more like a jet powered slide than walking as it is 400 m/s or approx 895 mph!