The calculated distance (air line) between Siu Hei and Jardine's Lookout is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Jardine's Lookout is certainly longer, as only the direct route (as the crow flies) between Siu Hei and Jardine's Lookout has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles