The calculated distance (air line) between Duisburg and Loison-sous-Lens is approximately 184 miles respectively 296 kilometers.
By car or train, the actual journey to Loison-sous-Lens is certainly longer, as only the direct route (as the crow flies) between Duisburg and Loison-sous-Lens has been calculated here.
Air line (approximately)
296 kilometers
159 nautical miles