The calculated distance (air line) between Tuen Mun and Tai Mei Tuk is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Tai Mei Tuk is certainly longer, as only the direct route (as the crow flies) between Tuen Mun and Tai Mei Tuk has been calculated here.
Air line (approximately)
29 kilometers
15 nautical miles