The calculated distance (air line) between Sinmak and Chaeryŏng-ŭp is approximately 33 miles respectively 54 kilometers.
By car or train, the actual journey to Chaeryŏng-ŭp is certainly longer, as only the direct route (as the crow flies) between Sinmak and Chaeryŏng-ŭp has been calculated here.
Air line (approximately)
54 kilometers
29 nautical miles