The calculated distance (air line) between Yuen Long Kau Hui and Lam Tin is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Lam Tin is certainly longer, as only the direct route (as the crow flies) between Yuen Long Kau Hui and Lam Tin has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles