The calculated distance (air line) between Maulavi Bāzār and Hailākāndi is approximately 51 miles respectively 83 kilometers.
By car or train, the actual journey to Hailākāndi is certainly longer, as only the direct route (as the crow flies) between Maulavi Bāzār and Hailākāndi has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles