The calculated distance (air line) between Pui O and Yuen Long Kau Hui is approximately 15 miles respectively 23 kilometers.
By car or train, the actual journey to Yuen Long Kau Hui is certainly longer, as only the direct route (as the crow flies) between Pui O and Yuen Long Kau Hui has been calculated here.
Air line (approximately)
23 kilometers
13 nautical miles