The calculated distance (air line) between Humen and Yung Shue Wan is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Yung Shue Wan is certainly longer, as only the direct route (as the crow flies) between Humen and Yung Shue Wan has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles