The calculated distance (air line) between Wezembeek-Oppem and Charleroi is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Charleroi is certainly longer, as only the direct route (as the crow flies) between Wezembeek-Oppem and Charleroi has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles