The calculated distance (air line) between Jardine's Lookout and Tin Shui Wai is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Tin Shui Wai is certainly longer, as only the direct route (as the crow flies) between Jardine's Lookout and Tin Shui Wai has been calculated here.
Air line (approximately)
29 kilometers
15 nautical miles