The calculated distance (air line) between Novyy Rogachik and Tsimlyansk is approximately 115 miles respectively 185 kilometers.
By car or train, the actual journey to Tsimlyansk is certainly longer, as only the direct route (as the crow flies) between Novyy Rogachik and Tsimlyansk has been calculated here.
Air line (approximately)
185 kilometers
100 nautical miles