The calculated distance (air line) between Al Khaḑrā’ and Bani Walid is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Bani Walid is certainly longer, as only the direct route (as the crow flies) between Al Khaḑrā’ and Bani Walid has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles