The calculated distance (air line) between Demba and Mbuji-Mayi is approximately 101 miles respectively 162 kilometers.
By car or train, the actual journey to Mbuji-Mayi is certainly longer, as only the direct route (as the crow flies) between Demba and Mbuji-Mayi has been calculated here.
Air line (approximately)
162 kilometers
88 nautical miles