The calculated distance (air line) between Tai Kok Tsui and Ngong Ping is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Ngong Ping is certainly longer, as only the direct route (as the crow flies) between Tai Kok Tsui and Ngong Ping has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles