Vср=(S1+S2+S3)/(t1+t2+t3)=(30+58+45)/(20+40+30)=133/90=1,4777...=1,5 м/с
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Vср=(S1+S2+S3)/(t1+t2+t3)=(30+58+45)/(20+40+30)=133/90=1,4777...=1,5 м/с