The calculated distance (air line) between Kharjā and Wādī as Sīr is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Wādī as Sīr is certainly longer, as only the direct route (as the crow flies) between Kharjā and Wādī as Sīr has been calculated here.
Air line (approximately)
79 kilometers
42 nautical miles