Câu 5 Một huyện dự định xây dựng một trạm nước sạch để cung cấp cho hai khu dân cư A và B . Trạm nước sạch đặt tại vị trí T trên bờ sông. Biết AB = 3 17 km, khoảng cách từ A và B đến bờ sông lần lượt là AH = 3km , BK = 6km (hình vẽ). Gọi S là tổng độ dài đường ống từ trạm nước đến A và B Giá trị nhỏ nhất của S là bao nhiêu? A.15 km B.14,32 km C.15,56 km D.16 km

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