The calculated distance (air line) between Qaşr al Qarabūllī and Bani Walid is approximately 71 miles respectively 114 kilometers.
By car or train, the actual journey to Bani Walid is certainly longer, as only the direct route (as the crow flies) between Qaşr al Qarabūllī and Bani Walid has been calculated here.
Air line (approximately)
114 kilometers
62 nautical miles