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dohang23112004
2 năm trước
Một ô tô đi từ A lúc 4 giờ 30 phút và tới B lúc 9 giờ. Dọc đường xe có nghỉ tại C và D, mỗi nơi 20 phút. Hỏi không kể thời gian dừng dọc đường, xe đi từ A đến B hết bao nhiêu thời gian?
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