The calculated distance (air line) between Morlanwelz-Mariemont and Namur is approximately 27 miles respectively 44 kilometers.
By car or train, the actual journey to Namur is certainly longer, as only the direct route (as the crow flies) between Morlanwelz-Mariemont and Namur has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles