The calculated distance (air line) between Itaocara and Duque de Caxias is approximately 110 miles respectively 178 kilometers.
By car or train, the actual journey to Duque de Caxias is certainly longer, as only the direct route (as the crow flies) between Itaocara and Duque de Caxias has been calculated here.
Air line (approximately)
178 kilometers
96 nautical miles