The calculated distance (air line) between Yuen Long Kau Hui and Yau Tong is approximately 17 miles respectively 27 kilometers.
By car or train, the actual journey to Yau Tong is certainly longer, as only the direct route (as the crow flies) between Yuen Long Kau Hui and Yau Tong has been calculated here.
Air line (approximately)
27 kilometers
15 nautical miles