The calculated distance (air line) between Sīdī Sālim and Zefta is approximately 47 miles respectively 76 kilometers.
By car or train, the actual journey to Zefta is certainly longer, as only the direct route (as the crow flies) between Sīdī Sālim and Zefta has been calculated here.
Air line (approximately)
76 kilometers
41 nautical miles