S1=3
S2=v2*t2=12*0.8=9.6
vcp=(S1+S2)/(t1+t2)
t1=S1/v1=3/15 ч
vcp=(3+9.6)/(3/15+0.8)=12.6 км/ч
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S1=3
S2=v2*t2=12*0.8=9.6
vcp=(S1+S2)/(t1+t2)
t1=S1/v1=3/15 ч
vcp=(3+9.6)/(3/15+0.8)=12.6 км/ч