The calculated distance (air line) between Rājshāhi and Nārāyanganj is approximately 131 miles respectively 211 kilometers.
By car or train, the actual journey to Nārāyanganj is certainly longer, as only the direct route (as the crow flies) between Rājshāhi and Nārāyanganj has been calculated here.
Air line (approximately)
211 kilometers
114 nautical miles