The calculated distance (air line) between T’aebaek and Yangp'yŏng is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between T’aebaek and Yangp'yŏng has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles