The calculated distance (air line) between Hwangju-ŭp and Kujang-ŭp is approximately 84 miles respectively 135 kilometers.
By car or train, the actual journey to Kujang-ŭp is certainly longer, as only the direct route (as the crow flies) between Hwangju-ŭp and Kujang-ŭp has been calculated here.
Air line (approximately)
135 kilometers
73 nautical miles