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t=20 [min]=20/60 [h]=1/3 [h] czas ruchu
V predkosc
s=Vt
V=s:t
V=11:(1/3)
V=11*3
V=33 [km/h]
Odp.: predkosc wynosi 33 [km/h]
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lub:
w ciagu 20 [min] przebyl 11 [km]
↓*3 ↓*3
w ciagu 60[min]=1[h] przebyl 33 [km]