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V=1,5 km/10 min=0,15 m/min
s=1,5km=1,5*1000m=1500m
V=s/t
V=1500m/600s
V=2,5m/s
Odp.Kolejka jechała z średnią prędkością 2,5 m/s
t=10 min=600 s
v=s/t=1500m/600s=2.5 m/s