The calculated distance (air line) between Molenbeek-Saint-Jean and Merksem is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Merksem is certainly longer, as only the direct route (as the crow flies) between Molenbeek-Saint-Jean and Merksem has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles