The calculated distance (air line) between Sarpol-e Z̄ahāb and Javānrūd is approximately 44 miles respectively 71 kilometers.
By car or train, the actual journey to Javānrūd is certainly longer, as only the direct route (as the crow flies) between Sarpol-e Z̄ahāb and Javānrūd has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles