The calculated distance (air line) between Duisburg and Wezembeek-Oppem is approximately 107 miles respectively 172 kilometers.
By car or train, the actual journey to Wezembeek-Oppem is certainly longer, as only the direct route (as the crow flies) between Duisburg and Wezembeek-Oppem has been calculated here.
Air line (approximately)
172 kilometers
93 nautical miles