The calculated distance (air line) between Morlanwelz-Mariemont and Mouscron is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Mouscron is certainly longer, as only the direct route (as the crow flies) between Morlanwelz-Mariemont and Mouscron has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles