S=(v-u)t1=(v+u)t2
vt1-ut1=vt2+ut2
v(t1-t2)=u(t1+t2)
v=u(t1+t2)/(t1-t2)
v=21 км/ч
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S=(v-u)t1=(v+u)t2
vt1-ut1=vt2+ut2
v(t1-t2)=u(t1+t2)
v=u(t1+t2)/(t1-t2)
v=21 км/ч