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V2=22,22m/s
t=s/v
t1=0,5S/V1=0,5S/16,67=0,03S
t2=0.5S/V2=0,5S/22,22=0,02S
Vśr=S/t1+t2=S/(0,03S+0,02S)=S/0,05S=1/0,05=20[m/s]=72[km/h]