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2 vật xuất phát từ 2 điểm A và B cách nhau 400m,chuyển động cùng chiều theo hướng từ A đến B.Vật thứ nhất đi từ A với vật tốc 36km/h.Vật thứ hai đi từ B với vận tốc 18km/h.Hỏi sau bao lâu hai vật gặp nhau?xác định chỗ gặp nhau đó.Coi chuyển động của 2 xe là đều
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