An average walking speed is between five and six kilometers per hour.
At the bottom end of that scale then, we get:
5km/h = 5000m/3600s = 25m/18s
350m / (25m / 18s) = 252s
or four minutes and twelve seconds.
At the high end of that scale, we have:
6km/h = 6000m/3600s = 5m/3s
350m / (5m / 3s) = 210s
or three minutes and thirty seconds
So for someone to walk 350 meters at an average speed would take roughly between three and a half to four and a fifth minutes.
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In
0.350 meters are in 350 mm.
The average human walking speed is around 2.8 mph per wikipedia. Therefore the "average human" if capable of non-stop walking without breaks could walk 350 miles in ~125 hours. Or 5 days and 5 hours of continuous walking. But how long would it take to walk 500 miles, and how long to walk 500 more, just the be the man who walks a thousand miles to fall down at your door?
3.5
3.5 meters or 350 centimetres.