The calculated distance (air line) between Pyŏksŏng-ŭp and Namp’o is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Namp’o is certainly longer, as only the direct route (as the crow flies) between Pyŏksŏng-ŭp and Namp’o has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles