The calculated distance (air line) between Madīnat an Naşr and Zefta is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Zefta is certainly longer, as only the direct route (as the crow flies) between Madīnat an Naşr and Zefta has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles