The calculated distance (air line) between Comilla and Chhāgalnāiya is approximately 37 miles respectively 59 kilometers.
By car or train, the actual journey to Chhāgalnāiya is certainly longer, as only the direct route (as the crow flies) between Comilla and Chhāgalnāiya has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles