The calculated distance (air line) between Ar-Raḥaībāt and Msalātah is approximately 138 miles respectively 222 kilometers.
By car or train, the actual journey to Msalātah is certainly longer, as only the direct route (as the crow flies) between Ar-Raḥaībāt and Msalātah has been calculated here.
Air line (approximately)
222 kilometers
120 nautical miles