The calculated distance (air line) between Ar-Raḥaībāt and Zliten is approximately 165 miles respectively 266 kilometers.
By car or train, the actual journey to Zliten is certainly longer, as only the direct route (as the crow flies) between Ar-Raḥaībāt and Zliten has been calculated here.
Air line (approximately)
266 kilometers
143 nautical miles