The calculated distance (air line) between Arīsh and Bayt Lāhyā is approximately 50 miles respectively 81 kilometers.
By car or train, the actual journey to Bayt Lāhyā is certainly longer, as only the direct route (as the crow flies) between Arīsh and Bayt Lāhyā has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles