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khaitn5421
2 năm trước
Cho quãng đường AB dài 108 km. Hai xe xuất phát cùng lúc nhưng ngược chiều. Xe thứ nhất xuất phát từ A với vận tốc là 40 km\h, xe thứ hai xuất phát từ B với vận tốc là 50 km\h. Hỏi sau mấy giờ thì hai xe gặp nhau.
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