The calculated distance (air line) between Bnei Brak and Bet Shemesh is approximately 26 miles respectively 42 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 Brak and Bet Shemesh has been calculated here.
Air line (approximately)
42 kilometers
23 nautical miles