The calculated distance (air line) between Mīr Bachah Kōṯ and Gardez is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Gardez is certainly longer, as only the direct route (as the crow flies) between Mīr Bachah Kōṯ and Gardez has been calculated here.
Air line (approximately)
129 kilometers
69 nautical miles