The calculated distance (air line) between Yŏnggwang-ŭp and Kowŏn-ŭp is approximately 42 miles respectively 67 kilometers.
By car or train, the actual journey to Kowŏn-ŭp is certainly longer, as only the direct route (as the crow flies) between Yŏnggwang-ŭp and Kowŏn-ŭp has been calculated here.
Air line (approximately)
67 kilometers
36 nautical miles