дано S1=3S\4 v1=80 км\ч S2=S\4 V2=40км\ч
Vср=S\(t1+t2)= S\(3S\320+S\160)=1\(3+2) :320=320\5=64 км\ч
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дано S1=3S\4 v1=80 км\ч S2=S\4 V2=40км\ч
Vср=S\(t1+t2)= S\(3S\320+S\160)=1\(3+2) :320=320\5=64 км\ч