The calculated distance (air line) between L'Hospitalet de Llobregat and Rubí is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Rubí is certainly longer, as only the direct route (as the crow flies) between L'Hospitalet de Llobregat and Rubí has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles