The calculated distance (air line) between Paray-Vieille-Poste and Rouen is approximately 76 miles respectively 123 kilometers.
By car or train, the actual journey to Rouen is certainly longer, as only the direct route (as the crow flies) between Paray-Vieille-Poste and Rouen has been calculated here.
Air line (approximately)
123 kilometers
66 nautical miles