Một ô tô đi từ A đến B với vận tốc 45 km/h. Sau

ta có hpt :\(\left\{{}\begin{matrix}\dfrac{s}{45}-\dfrac{s}{60}=t\\\dfrac{s-30}{45}-\left(\dfrac{\dfrac{S}{2}}{60}+\dfrac{\dfrac{s}{2}-30}{55}\right)=t\end{matrix}\right.\)

t là thời thời gian giữa hai xe xuất phát

tự giải đi

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