The calculated distance (air line) between Guri-si and Yangp'yŏng is approximately 21 miles respectively 33 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Guri-si and Yangp'yŏng has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles