The calculated distance (air line) between Ar-Raḥaībāt and Bani Walid is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Bani Walid is certainly longer, as only the direct route (as the crow flies) between Ar-Raḥaībāt and Bani Walid has been calculated here.
Air line (approximately)
203 kilometers
109 nautical miles