The calculated distance (air line) between Al Qāhirah al Jadīdah and Zefta is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Zefta is certainly longer, as only the direct route (as the crow flies) between Al Qāhirah al Jadīdah and Zefta has been calculated here.
Air line (approximately)
77 kilometers
42 nautical miles