The calculated distance (air line) between Bačko Petrovo Selo and Čačak is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Čačak is certainly longer, as only the direct route (as the crow flies) between Bačko Petrovo Selo and Čačak has been calculated here.
Air line (approximately)
203 kilometers
110 nautical miles