The calculated distance (air line) between Hau-ri and Sŭngjibaegam is approximately 35 miles respectively 56 kilometers.
By car or train, the actual journey to Sŭngjibaegam is certainly longer, as only the direct route (as the crow flies) between Hau-ri and Sŭngjibaegam has been calculated here.
Air line (approximately)
56 kilometers
30 nautical miles