The calculated distance (air line) between Gangneung and Yangp'yŏng is approximately 78 miles respectively 125 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Gangneung and Yangp'yŏng has been calculated here.
Air line (approximately)
125 kilometers
68 nautical miles