The calculated distance (air line) between Ar Rumaythīyah and Qaisumah is approximately 137 miles respectively 220 kilometers.
By car or train, the actual journey to Qaisumah is certainly longer, as only the direct route (as the crow flies) between Ar Rumaythīyah and Qaisumah has been calculated here.
Air line (approximately)
220 kilometers
119 nautical miles