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V1=80km/h
t2=20min=(1/3)h
V2=60km/h
V=?
-----------------------------------
V=s/t
s=V*t
s1=V1*t1=80km/h*0,25h=20km
s2=V2*t2=60km/h*(1/3)h=20km
s=s1+s2=20km+20km=40km
t=t1+t2=15min+20min=35min=0,58h
V=s/t=40km/0,58h=69km/h