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Ответ дан
Lycko67

Відповідь:

Пояснення:

v=(S1+S2)/(t1+t2)

t1= 30/60=0.5год

t2= 40/80=0.5год

Якщо t1=t2, то v= (v1+v2)/2 = 140/2=70км/год

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