vcp=(S/2+S/2)/(S/(2*v1)+S/(2*v2)=2*v1*v2/(v1+v2)=2*50*80/(50+80)=61.5 км/ч
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vcp=(S/2+S/2)/(S/(2*v1)+S/(2*v2)=2*v1*v2/(v1+v2)=2*50*80/(50+80)=61.5 км/ч