The calculated distance (air line) between Pak Shek Kok and Ngong Ping is approximately 23 miles respectively 36 kilometers.
By car or train, the actual journey to Ngong Ping is certainly longer, as only the direct route (as the crow flies) between Pak Shek Kok and Ngong Ping has been calculated here.
Air line (approximately)
36 kilometers
20 nautical miles