The calculated distance (air line) between Sha Tau Kok and Sham Shui Po is approximately 15 miles respectively 25 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 Sha Tau Kok and Sham Shui Po has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles