The calculated distance (air line) between Ar Raḩmānīyah and Ḩalwān is approximately 96 miles respectively 154 kilometers.
By car or train, the actual journey to Ḩalwān is certainly longer, as only the direct route (as the crow flies) between Ar Raḩmānīyah and Ḩalwān has been calculated here.
Air line (approximately)
154 kilometers
83 nautical miles