The calculated distance (air line) between Khulna and Rāmchandrapur is approximately 70 miles respectively 112 kilometers.
By car or train, the actual journey to Rāmchandrapur is certainly longer, as only the direct route (as the crow flies) between Khulna and Rāmchandrapur has been calculated here.
Air line (approximately)
112 kilometers
60 nautical miles