The calculated distance (air line) between Sremski Karlovci and Požarevac is approximately 73 miles respectively 118 kilometers.
By car or train, the actual journey to Požarevac is certainly longer, as only the direct route (as the crow flies) between Sremski Karlovci and Požarevac has been calculated here.
Air line (approximately)
118 kilometers
64 nautical miles