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t=s/v
s=20km
v=12km/h
t=20km/12km/h = 20/12h = 5/3h = 1h 40min
II odcinek
s=24km
v=12km/h5
t=24km/12km/h = 24/12h = 2h
km/h
średnia predkosc, to12km/h