The calculated distance (air line) between Hwangju-ŭp and Kowŏn-ŭp is approximately 95 miles respectively 153 kilometers.
By car or train, the actual journey to Kowŏn-ŭp is certainly longer, as only the direct route (as the crow flies) between Hwangju-ŭp and Kowŏn-ŭp has been calculated here.
Air line (approximately)
153 kilometers
82 nautical miles