The calculated distance (air line) between Gardez and Zarghūn Shahr is approximately 69 miles respectively 111 kilometers.
By car or train, the actual journey to Zarghūn Shahr is certainly longer, as only the direct route (as the crow flies) between Gardez and Zarghūn Shahr has been calculated here.
Air line (approximately)
111 kilometers
60 nautical miles