The calculated distance (air line) between Yŏnggwang-ŭp and Kusŏng is approximately 117 miles respectively 188 kilometers.
By car or train, the actual journey to Kusŏng is certainly longer, as only the direct route (as the crow flies) between Yŏnggwang-ŭp and Kusŏng has been calculated here.
Air line (approximately)
188 kilometers
102 nautical miles