The calculated distance (air line) between Yangju and Chaeryŏng-ŭp is approximately 88 miles respectively 141 kilometers.
By car or train, the actual journey to Chaeryŏng-ŭp is certainly longer, as only the direct route (as the crow flies) between Yangju and Chaeryŏng-ŭp has been calculated here.
Air line (approximately)
141 kilometers
76 nautical miles