v ср=(s1+s2)/(t1+t2)
s1=70*2=140км
s2=80*3=240км
v ср=(140+240)/(2+3)=380/5=76км/ч
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v ср=(s1+s2)/(t1+t2)
s1=70*2=140км
s2=80*3=240км
v ср=(140+240)/(2+3)=380/5=76км/ч