The calculated distance (air line) between Sīdī Sālim and Quwaysinā is approximately 54 miles respectively 86 kilometers.
By car or train, the actual journey to Quwaysinā is certainly longer, as only the direct route (as the crow flies) between Sīdī Sālim and Quwaysinā has been calculated here.
Air line (approximately)
86 kilometers
47 nautical miles