The calculated distance (air line) between Hang Hau and Yuen Long San Hui is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Yuen Long San Hui is certainly longer, as only the direct route (as the crow flies) between Hang Hau and Yuen Long San Hui has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles