The calculated distance (air line) between Tona and Arenys de Munt is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Arenys de Munt is certainly longer, as only the direct route (as the crow flies) between Tona and Arenys de Munt has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles