The calculated distance (air line) between Qarqīn and Mazār-e Sharīf is approximately 77 miles respectively 123 kilometers.
By car or train, the actual journey to Mazār-e Sharīf is certainly longer, as only the direct route (as the crow flies) between Qarqīn and Mazār-e Sharīf has been calculated here.
Air line (approximately)
123 kilometers
67 nautical miles