About 77.2 kilometers. According to Baidu map, it takes about 1 hour and 3 minutes to drive from Dingxi City to Longxi County and from Zhonghua Road Auxiliary Road to Xianmen Street. It is about 77.2 kilometers via Lianhuo Expressway and Wei Long Expressway, and it takes about 4 hours and 22 minutes by bus from Dingxi City to Longxi County. Get on Dingxi Weiyuan Intercity Bus No.777, get off at Longxi Expressway intersection station and get on Longxi Bus No.2.