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predkosc= 120 km: 2/3 h=180km/h
40 min = 2/3 godz
1/3 godz = 120km : 2 = 60km
3/3 godz = 60 km*3 = 180km
Odp: Helikopter porusza się z prędkością 180 km/h.
:)