The calculated distance (air line) between Novyy Rogachik and Nikolayevsk is approximately 113 miles respectively 181 kilometers.
By car or train, the actual journey to Nikolayevsk is certainly longer, as only the direct route (as the crow flies) between Novyy Rogachik and Nikolayevsk has been calculated here.
Air line (approximately)
181 kilometers
98 nautical miles