How far is the difference between Laojun ditch and Gao Qiao ditch in Mengtun River?

The difference between Laojun ditch and Gao Qiao ditch in Mengtun River is 38 kilometers. The distance from Laojungou in Mengtunhe River to Gao Qiao ditch is 3.8cm on the map software. According to the ratio of 1: 100000 in kilometers, you can get 3.8* 100000=38 (kilometers). The scenic spot of Mengtunhe River Basin is located in Shangmeng Township and Summer Dream in the northwest of Lixian County, Aba Tibetan and Qiang Autonomous Prefecture. It is located in the eastern margin of the Qinghai-Tibet Plateau, with typical sub-plateau cutting landforms and climate characteristics. The scenic area is 7 14.5 square kilometers.