The calculated distance (air line) between Pul-e Khumrī and Nahrīn is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Nahrīn is certainly longer, as only the direct route (as the crow flies) between Pul-e Khumrī and Nahrīn has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles