The calculated distance (air line) between Rio Claro and Duque de Caxias is approximately 53 miles respectively 85 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 Rio Claro and Duque de Caxias has been calculated here.
Air line (approximately)
85 kilometers
46 nautical miles