The calculated distance (air line) between Mirzāpur and Nārāyanganj is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to Nārāyanganj is certainly longer, as only the direct route (as the crow flies) between Mirzāpur and Nārāyanganj has been calculated here.
Air line (approximately)
68 kilometers
37 nautical miles