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