The calculated distance (air line) between Ḩadīthah and Al Musayyib is approximately 145 miles respectively 233 kilometers.
By car or train, the actual journey to Al Musayyib is certainly longer, as only the direct route (as the crow flies) between Ḩadīthah and Al Musayyib has been calculated here.
Air line (approximately)
233 kilometers
126 nautical miles