The calculated distance (air line) between Char Bhadrāsan and Sātkhira is approximately 84 miles respectively 136 kilometers.
By car or train, the actual journey to Sātkhira is certainly longer, as only the direct route (as the crow flies) between Char Bhadrāsan and Sātkhira has been calculated here.
Air line (approximately)
136 kilometers
73 nautical miles