The calculated distance (air line) between Gwangmyeong and Yangp'yŏng is approximately 34 miles respectively 55 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Gwangmyeong and Yangp'yŏng has been calculated here.
Air line (approximately)
55 kilometers
30 nautical miles