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lahongngan
1 năm trước
Lúc 5 giờ, một ô tô tải đi từ A với vận tốc 40km/giờ . Đến 7 giờ, một ô tô du lịch cũng đi từ A với vận tốc 60km/giờ và đi cùng chiều với ô tô tải. Hỏi đến mấy giờ thì ô tô du lịch đuổi kịp ô tô tải?
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