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t=0,5min=30s
s=1km=1000m
V=s/t
V=1000/30=33,(3)m/s
33,(3)m/s*0,001*3600=120km/h
60min=3600s
1km/0,5min 1km/30s
3600:30=120
120km/h
Samochód jedzie z prędkością 120km/h.