The calculated distance (air line) between Duque de Caxias and Ouro Preto is approximately 166 miles respectively 267 kilometers.
By car or train, the actual journey to Ouro Preto is certainly longer, as only the direct route (as the crow flies) between Duque de Caxias and Ouro Preto has been calculated here.
Air line (approximately)
267 kilometers
144 nautical miles