The calculated distance (air line) between Pyŏksŏng-ŭp and Anju is approximately 109 miles respectively 175 kilometers.
By car or train, the actual journey to Anju is certainly longer, as only the direct route (as the crow flies) between Pyŏksŏng-ŭp and Anju has been calculated here.
Air line (approximately)
175 kilometers
94 nautical miles