một ô tô đi từ a đến b với vận tốc 50km/h mất 2 giờ 15 phút . Hỏi chiếc ô tô chạy từ a đến b với vận tốc 45km/h thì hết bao nhiêu thời gian ( bài toán đại lượng tỉ lệ nghịch ạ đừng chép trên mạng em đọc rồi sai ạ )

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