anh trung lái xe từ tphcm về an giang anh đi được 30 km trong giờ đâu tiên nhưng anh nhận ra sẽ muộn hơn 1 giờ (so với thời gian dự định) nếu tiếp tục với vận tốc này.anh tăng tốc cuả mình 15 km 1 giờ cho quãng đường còn lại và đến nơi sớm hơn 30phut.tính quãng đường anh đi

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