The calculated distance (air line) between Tai Mong Tsai and Kowloon is approximately 10 miles respectively 15 kilometers.
By car or train, the actual journey to Kowloon is certainly longer, as only the direct route (as the crow flies) between Tai Mong Tsai and Kowloon has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles