The calculated distance (air line) between Mehendiganj and Nārāyanganj is approximately 55 miles respectively 88 kilometers.
By car or train, the actual journey to Nārāyanganj is certainly longer, as only the direct route (as the crow flies) between Mehendiganj and Nārāyanganj has been calculated here.
Air line (approximately)
88 kilometers
47 nautical miles