The calculated distance (air line) between Narang Mandi and Derā Nānak is approximately 31 miles respectively 51 kilometers.
By car or train, the actual journey to Derā Nānak is certainly longer, as only the direct route (as the crow flies) between Narang Mandi and Derā Nānak has been calculated here.
Air line (approximately)
51 kilometers
27 nautical miles