The calculated distance (air line) between Bani Walid and Qaşr Bin Ghashīr is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Qaşr Bin Ghashīr is certainly longer, as only the direct route (as the crow flies) between Bani Walid and Qaşr Bin Ghashīr has been calculated here.
Air line (approximately)
129 kilometers
69 nautical miles