giúp em nhanh nhá em vote 5 sao và cho câu trả lời hay nhất luôn Anh Quang đi xe đạp, anh Bảo đi xe máy và anh Sơn đi ô tô cùng khởi hành từ A và đi cùng chiều nhau. Giờ khởi hành, theo thứ tự nói trên lúc 6h, 7h, 8h. Vận tốc trung bình của họ theo thứ tự trên là 10 km/h, 30 km/h, 40 km/h. Hỏi đến mấy giờ thì anh Sơn cách đều anh Quang và anh Bảo?

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