The calculated distance (air line) between Sangsŏng-ni and Paek'ak is approximately 71 miles respectively 115 kilometers.
By car or train, the actual journey to Paek'ak is certainly longer, as only the direct route (as the crow flies) between Sangsŏng-ni and Paek'ak has been calculated here.
Air line (approximately)
115 kilometers
62 nautical miles