The calculated distance (air line) between Paltan and Bhairab Bāzār is approximately 42 miles respectively 67 kilometers.
By car or train, the actual journey to Bhairab Bāzār is certainly longer, as only the direct route (as the crow flies) between Paltan and Bhairab Bāzār has been calculated here.
Air line (approximately)
67 kilometers
36 nautical miles