The calculated distance (air line) between Kimhae and Yangp'yŏng is approximately 174 miles respectively 280 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Kimhae and Yangp'yŏng has been calculated here.
Air line (approximately)
280 kilometers
151 nautical miles