A = N 23° 05.450' E 113° 14.084'
B = N 23° 11.060' E 113° 13.996'
C = ?
There are three locations in Guangzhou named with "Julong(聚龙)", and they are located in three different districts: Julong Industrial Zone(聚龙工业区) in Baiyun District, Julong Ancient Village(聚龙古村) in Liwan District and Julong Street(聚龙街) in Tianhe District. Interestingly, these three locations form a roughly equilateral triangle with an edge length of approximately 11km on the map of Guangzhou.
In fact, the triangle is not strictly equilateral, and the lengths of the three edges will probably vary by around 300 metres. Thus, if Julong Industrial Zone (Point A) and Julong Ancient Village (Point B) are each the two vertices of the equilateral triangle, the third vertex will be located somewhere else in Tianhe District (Point C).
Please calculate the coordinates of Point C(considering the length of 1° in latitude is equal to the length of 1° in longitude), where the cache is located. Follow the hint to find it once you reach your calculated location.
广州有三处以“聚龙”为名的地点，且分列于三个不同的区，它们分别是白云区的聚龙工业区、荔湾区的聚龙古村、天河区的聚龙街。有趣的是，这三个地点在广州的版图上刚好能大致组成一个边长约为 11km 的等边三角形。
实际上，这个三角形并不严格等边，三边的长度大概会有 300 米左右的差距。因此，如果以聚龙工业区（A）、聚龙古村（B）分别为等边三角形的两个顶点，第三个顶点将会位于天河区的另外某个位置（C）。
请计算出 C 的坐标（计算时认为 1° 经度与 1° 纬度的长度相等），藏宝点位于该坐标处，前往藏宝点后即可按照提示寻找。
You can validate your puzzle solution with certitude.