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t1=20min=1/3h
V1=60km/h
S2=10km
V2=80km/h
Vśr=?
S1=V1*t1=60km/h *1/3h= 20km
t2=S2/V2=(10km)/(80km/h)= 1/8h
Vśr=(Sc)/(tc) <wzór (prędk. średn.=całkowita droga/całkowity czas ruchu)
Vśr=(Sc)/(tc)=(S1+S2)/(t1+t2)=(20km + 10km)/(1/3h + 1/8h)= 65,4545 km/h