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lethihoaithuong710
2 năm trước
Lúc 7 giờ, một ô tô chở hàng đi từ A với vận tốc 45km. Sau 2 giờ, một ô tô du lịch cũng đi từ A với vận tốc 60 km/giờ và đi cùng chiều với ô tô chở hàng. Hỏi kể từ lúc bắt đầu đi, sau mấy giờ thì ô tô du lịch đuổi kịp ô tô chở hàng?
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