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2 năm trước
.Một xe đạp khởi hành từ điểm A,chạy với vận tốc 20km/h. Sau đó 3 giờ, một xe hơi cũng khởi hành từ điểm A, đuổi theo xe đạp với vận tốc 50km/h. Hỏi xe hơi chạy trong bao lâu thì đuổi kịp xe đạp?
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