The calculated distance (air line) between Sremska Mitrovica and Kragujevac is approximately 92 miles respectively 149 kilometers.
By car or train, the actual journey to Kragujevac is certainly longer, as only the direct route (as the crow flies) between Sremska Mitrovica and Kragujevac has been calculated here.
Air line (approximately)
149 kilometers
80 nautical miles