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72km/h = 20m/s
60km = 60000m
60000m : 20m/s = 3000s
3000s=50min
II strona:
108km/h + 30m/s
60km = 60000m
60000m : 30m/s = 2000s
2000s ~30 min
Całkowity czas:
50min + 30 min + 20 min =100 min
Cała droga:
60km+60km=120km
120km=120000m
Prędkość średnia:
120000:100=120m/s