vcp=8 км/ч v1=2*v2
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vcp=(s/2+s/2)/(t1+t2)
t1=s/(2*v1) t2=s/(2*v2)
vcp=2*v2/3
v2=3*vcp/2=3*8/2=12 км/ч
v1=2*12=24 км/ч
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vcp=8 км/ч v1=2*v2
===
vcp=(s/2+s/2)/(t1+t2)
t1=s/(2*v1) t2=s/(2*v2)
vcp=2*v2/3
v2=3*vcp/2=3*8/2=12 км/ч
v1=2*12=24 км/ч
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