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thutu1974
2 năm trước
Cùng một lúc có 2 xe đi cùng từ A đến B. Xe thứ nhất đi với vận tốc 60km/h đến B lúc 8h40phut. Xe thứ 2 đi với vận tốc 40km/h và đến B lúc 9h05ph. Hỏi hai xe khởi hành lúc mấy giờ từ A
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