The calculated distance (air line) between Pak Shek Kok and Sham Shui Po is approximately 7 miles respectively 12 kilometers.
By car or train, the actual journey to Sham Shui Po is certainly longer, as only the direct route (as the crow flies) between Pak Shek Kok and Sham Shui Po has been calculated here.
Air line (approximately)
12 kilometers
6 nautical miles