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Một ô tô chở hàng từ A về B lúc 3h với vận tốc là 60km/h. Một ô tô khác cũng đi từ A về B lúc 3h 20 phút với vận tốc 70km/h. AB dài 150km . Hỏi ô tô thứ hai đuổi kịp ô tô thứ nhất lúc mấy giờ ? Nơi đó cách B bao nhiêu ?
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