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It's imossible, because avarage speed of human walking is from 5km to 5.5km per hour, maximum one is about 6.5km per hour. If you walk with avarage speed (5km/h), it will take 12 minutes (for 1km=100000mm). If you walk with maximum speed (6.5km/h), it will take 11+ minutes (for 1km=100000mm)
A good half an hour :) Since it takes on average 12 minutes to walk 1km, 2km would be 24 minutes so for 2.5km...30 minutes
1km = 1,000m which is larger than 334m
100cm=1m 1000m=1km so 100cm/1m x1000m/1km = 10,000cm/km or 1km = 10,000cm
1km = 1000m2.5km x 1000m/1km = 2500m