Vср=S1*S2/t1*t2
Sq=V1*t1
20мин=0.3часа
S1=54*0.3=16.2
t2=S2/V2
t2=3/18=0.2
Vcp=16.2*0.2/3*0.3=3.6км/ч
Vср=S1*S2/t1*t2
Sq=V1*t1
20мин=0.3часа
S1=54*0.3=16.2
t2=S2/V2
t2=3/18=0.2
Vcp=16.2*0.2/3*0.3=3.6км/ч