The calculated distance (air line) between Nova Iguaçu and Duque de Caxias is approximately 9 miles respectively 15 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 Nova Iguaçu and Duque de Caxias has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles