How many kilometers is it from Deyang to Mianzhu?

Deyang City is 39.7 kilometers away from Mianzhu City. According to Baidu map, the distance between Deyang City and Mianzhu City measured by the map is 7.94 cm, and the ratio between the map and the actual geographical location is 1 km: 5 cm, and 7.94 cm *5 is equal to 39.7 km, so Deyang City is 39.7 km away from Mianzhu City.