The calculated distance (air line) between Tres Arroyos and Bahía Blanca is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Bahía Blanca is certainly longer, as only the direct route (as the crow flies) between Tres Arroyos and Bahía Blanca has been calculated here.
Air line (approximately)
177 kilometers
96 nautical miles