The calculated distance (air line) between Maulavi Bāzār and Khowai is approximately 30 miles respectively 49 kilometers.
By car or train, the actual journey to Khowai is certainly longer, as only the direct route (as the crow flies) between Maulavi Bāzār and Khowai has been calculated here.
Air line (approximately)
49 kilometers
26 nautical miles