The calculated distance (air line) between Duisburg and Pont-à-Mousson is approximately 177 miles respectively 285 kilometers.
By car or train, the actual journey to Pont-à-Mousson is certainly longer, as only the direct route (as the crow flies) between Duisburg and Pont-à-Mousson has been calculated here.
Air line (approximately)
285 kilometers
154 nautical miles