The calculated distance (air line) between Al Kūt and Ar Rumaythah is approximately 77 miles respectively 124 kilometers.
By car or train, the actual journey to Ar Rumaythah is certainly longer, as only the direct route (as the crow flies) between Al Kūt and Ar Rumaythah has been calculated here.
Air line (approximately)
124 kilometers
67 nautical miles