The calculated distance (air line) between Amiens and Hersin-Coupigny is approximately 41 miles respectively 66 kilometers.
By car or train, the actual journey to Hersin-Coupigny is certainly longer, as only the direct route (as the crow flies) between Amiens and Hersin-Coupigny has been calculated here.
Air line (approximately)
66 kilometers
36 nautical miles