The calculated distance (air line) between Ar Rahad and Umm Ruwaba is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Umm Ruwaba is certainly longer, as only the direct route (as the crow flies) between Ar Rahad and Umm Ruwaba has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles