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hathuphuong08092k3
2 năm trước
Hai ô tô khởi hành cùng một lúc từ hai tỉnh A và B cách nhau 150km đi ngược chiều và gặp nhau sau 2h. Biết rằng nếu vận tốc của ô tô đi từ A tăng thêm 15km/h thì bằng hai lần vận tốc ô tô đi từ B. Tính vận tốc ô tô đi từ B.
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