The calculated distance (air line) between Arīsh and Bayt Ḩānūn is approximately 52 miles respectively 83 kilometers.
By car or train, the actual journey to Bayt Ḩānūn is certainly longer, as only the direct route (as the crow flies) between Arīsh and Bayt Ḩānūn has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles