The calculated distance (air line) between Ar-Raḥaībāt and Al Khums is approximately 152 miles respectively 244 kilometers.
By car or train, the actual journey to Al Khums is certainly longer, as only the direct route (as the crow flies) between Ar-Raḥaībāt and Al Khums has been calculated here.
Air line (approximately)
244 kilometers
132 nautical miles