The calculated distance (air line) between Frankfurt am Main and Jemeppe-sur-Sambre is approximately 179 miles respectively 288 kilometers.
By car or train, the actual journey to Jemeppe-sur-Sambre is certainly longer, as only the direct route (as the crow flies) between Frankfurt am Main and Jemeppe-sur-Sambre has been calculated here.
Air line (approximately)
288 kilometers
155 nautical miles