The calculated distance (air line) between Chattogram and Chhāgalnāiya is approximately 52 miles respectively 83 kilometers.
By car or train, the actual journey to Chhāgalnāiya is certainly longer, as only the direct route (as the crow flies) between Chattogram and Chhāgalnāiya has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles