The calculated distance (air line) between Yuen Long Kau Hui and Kwun Tong is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Kwun Tong is certainly longer, as only the direct route (as the crow flies) between Yuen Long Kau Hui and Kwun Tong has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles