The calculated distance (air line) between Yuen Long Kau Hui and Taishan is approximately 81 miles respectively 131 kilometers.
By car or train, the actual journey to Taishan is certainly longer, as only the direct route (as the crow flies) between Yuen Long Kau Hui and Taishan has been calculated here.
Air line (approximately)
131 kilometers
71 nautical miles