The calculated distance (air line) between Sentmenat and La Roca del Vallès is approximately 10 miles respectively 17 kilometers.
By car or train, the actual journey to La Roca del Vallès is certainly longer, as only the direct route (as the crow flies) between Sentmenat and La Roca del Vallès has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles