The calculated distance (air line) between Duga Resa and Slavonski Brod is approximately 124 miles respectively 199 kilometers.
By car or train, the actual journey to Slavonski Brod is certainly longer, as only the direct route (as the crow flies) between Duga Resa and Slavonski Brod has been calculated here.
Air line (approximately)
199 kilometers
108 nautical miles