The calculated distance (air line) between Fray Bentos and Barros Blancos is approximately 174 miles respectively 280 kilometers.
By car or train, the actual journey to Barros Blancos is certainly longer, as only the direct route (as the crow flies) between Fray Bentos and Barros Blancos has been calculated here.
Air line (approximately)
280 kilometers
151 nautical miles