The calculated distance (air line) between Shahrak-e Emām Ḩasan and Rūdsar is approximately 128 miles respectively 206 kilometers.
By car or train, the actual journey to Rūdsar is certainly longer, as only the direct route (as the crow flies) between Shahrak-e Emām Ḩasan and Rūdsar has been calculated here.
Air line (approximately)
206 kilometers
111 nautical miles