The calculated distance (air line) between Ch’ŏngdan-ŭp and Kwail-ŭp is approximately 60 miles respectively 96 kilometers.
By car or train, the actual journey to Kwail-ŭp is certainly longer, as only the direct route (as the crow flies) between Ch’ŏngdan-ŭp and Kwail-ŭp has been calculated here.
Air line (approximately)
96 kilometers
52 nautical miles