The calculated distance (air line) between Ar Rumaythīyah and Khārk is approximately 136 miles respectively 219 kilometers.
By car or train, the actual journey to Khārk is certainly longer, as only the direct route (as the crow flies) between Ar Rumaythīyah and Khārk has been calculated here.
Air line (approximately)
219 kilometers
118 nautical miles