The calculated distance (air line) between Arāk and Khomeynī Shahr is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Khomeynī Shahr is certainly longer, as only the direct route (as the crow flies) between Arāk and Khomeynī Shahr has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles