The calculated distance (air line) between Duque de Caxias and Três Rios is approximately 47 miles respectively 75 kilometers.
By car or train, the actual journey to Três Rios is certainly longer, as only the direct route (as the crow flies) between Duque de Caxias and Três Rios has been calculated here.
Air line (approximately)
75 kilometers
41 nautical miles