The calculated distance (air line) between Mahrīz and Khomeynī Shahr is approximately 186 miles respectively 300 kilometers.
By car or train, the actual journey to Khomeynī Shahr is certainly longer, as only the direct route (as the crow flies) between Mahrīz and Khomeynī Shahr has been calculated here.
Air line (approximately)
300 kilometers
162 nautical miles