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Namnamls12
2 năm trước
hai tỉnh a và b cách nhau 82,5 km . lúc 7 giờ 15 phút một người đi xe đạo từ a đến b với vận tốc 15 km/h . Cùng lúc đó một người đi xe gắn máy với vận tốc 40 km /h từ b đến a . hỏi hai người gặp nhau luccs mấy giừo
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