The calculated distance (air line) between Hung Shui Kiu and Yau Tong is approximately 18 miles respectively 30 kilometers.
By car or train, the actual journey to Yau Tong is certainly longer, as only the direct route (as the crow flies) between Hung Shui Kiu and Yau Tong has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles