The calculated distance (air line) between Pukchil-lodongjagu and Kanggye is approximately 69 miles respectively 111 kilometers.
By car or train, the actual journey to Kanggye is certainly longer, as only the direct route (as the crow flies) between Pukchil-lodongjagu and Kanggye has been calculated here.
Air line (approximately)
111 kilometers
60 nautical miles