v1=36 км/ч v2=72 км/ч vcp=?
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s1=s2=s/2
vcp=(s1+s2)/(t1+t2)
t1=s1/v1 t2=s2/v2
vcp=(s/2 + s/2)/(s/(2*v1) + s/(2*v2))=2*v1*v2/(v1+v2)=2*36*72/(36+72)=48 км/ч
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v1=36 км/ч v2=72 км/ч vcp=?
===
s1=s2=s/2
vcp=(s1+s2)/(t1+t2)
t1=s1/v1 t2=s2/v2
vcp=(s/2 + s/2)/(s/(2*v1) + s/(2*v2))=2*v1*v2/(v1+v2)=2*36*72/(36+72)=48 км/ч
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