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S1=80km/h*2h=160km
S2=60km/h*1h=60km
S=S1+S2
S=160km+60km=220km
t1=2h
t2=1h
t=t1+t2
t=2h+1h=3h
V=220km/3h= 73⅓km/h
te jedynki i dwójki po S i t są w indeksie dolnym ;)