The calculated distance (air line) between Jemeppe-sur-Meuse and Uccle is approximately 52 miles respectively 84 kilometers.
By car or train, the actual journey to Uccle is certainly longer, as only the direct route (as the crow flies) between Jemeppe-sur-Meuse and Uccle has been calculated here.
Air line (approximately)
84 kilometers
45 nautical miles