The calculated distance (air line) between Sallent and Olesa de Montserrat is approximately 20 miles respectively 31 kilometers.
By car or train, the actual journey to Olesa de Montserrat is certainly longer, as only the direct route (as the crow flies) between Sallent and Olesa de Montserrat has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles