The calculated distance (air line) between Pyŏksŏng-ŭp and Chaeryŏng-ŭp is approximately 25 miles respectively 39 kilometers.
By car or train, the actual journey to Chaeryŏng-ŭp is certainly longer, as only the direct route (as the crow flies) between Pyŏksŏng-ŭp and Chaeryŏng-ŭp has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles