Ta có : \(V_{tb}=\frac{S_1+S_2}{t}=\frac{60.0,5t+40.0,5t}{t}\)=50km/h
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Ta có:
\(v_{tb}=\frac{s_1+s_2}{t_1+t_2}\\ < =>\frac{\left(v_1.t_1\right)+\left(v_2.t_2\right)}{\frac{1}{2}+\frac{1}{2}}\\ < =>\frac{\left(60.\frac{1}{2}\right)+\left(40.\frac{1}{2}\right)}{1}\\ =>\frac{30+20}{1}=50\left(\frac{km}{h}\right)\)