The calculated distance (air line) between Bnei Ayish and Bet Shemesh is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Bet Shemesh is certainly longer, as only the direct route (as the crow flies) between Bnei Ayish and Bet Shemesh has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles