v1=50 км/ч v2=80 км/ч vcp=?
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vcp=(s1+s2)/(t1+t2)
s1=s/2 s2=s/2
t1=s1/v1 t2=s2/v2
vcp=2*v1*v2/(v1+v2)=2*50*80/(50+80)=61.5 км/ч
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v1=50 км/ч v2=80 км/ч vcp=?
===
vcp=(s1+s2)/(t1+t2)
s1=s/2 s2=s/2
t1=s1/v1 t2=s2/v2
vcp=2*v1*v2/(v1+v2)=2*50*80/(50+80)=61.5 км/ч
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