V=S/t t=t1+t2=0,5*S/V1 +0,5*S/V2 V=(V1*V2)/0,5*(V1+V2)=12*10/0,5*(12+10)=10,9 км/ч
Vcp = S/t = S/(t1+t2) =S / (S/(2*12) +S/(2*10)) = 1/(1/24+1/20) = 120/11 =10,9 км/ч
V=S/t t=t1+t2=0,5*S/V1 +0,5*S/V2 V=(V1*V2)/0,5*(V1+V2)=12*10/0,5*(12+10)=10,9 км/ч
Vcp = S/t = S/(t1+t2) =S / (S/(2*12) +S/(2*10)) = 1/(1/24+1/20) = 120/11 =10,9 км/ч