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s1=200km
s2=100km
t1=3h
t2=2h
szukane
V=?
-----------------------------
s=s1+s2=200km+100km=300km
t=t1+t2=3h+2h=5h
V=s/t=300km/5h=60km/h
Srednia prędkość samochodu wynosiła 60km/h