The calculated distance (air line) between Rostov-na-Donu and Persianovka is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Persianovka is certainly longer, as only the direct route (as the crow flies) between Rostov-na-Donu and Persianovka has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles