The calculated distance (air line) between Morlanwelz-Mariemont and Liège is approximately 59 miles respectively 96 kilometers.
By car or train, the actual journey to Liège is certainly longer, as only the direct route (as the crow flies) between Morlanwelz-Mariemont and Liège has been calculated here.
Air line (approximately)
96 kilometers
52 nautical miles