The calculated distance (air line) between Rzhyshchiv and Pereiaslav is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Pereiaslav is certainly longer, as only the direct route (as the crow flies) between Rzhyshchiv and Pereiaslav has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles