The calculated distance (air line) between Pak Shek Kok and Ping Shan is approximately 13 miles respectively 20 kilometers.
By car or train, the actual journey to Ping Shan is certainly longer, as only the direct route (as the crow flies) between Pak Shek Kok and Ping Shan has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles