The calculated distance (air line) between Pervomayskoye and Nizhnegorskiy is approximately 47 miles respectively 75 kilometers.
By car or train, the actual journey to Nizhnegorskiy is certainly longer, as only the direct route (as the crow flies) between Pervomayskoye and Nizhnegorskiy has been calculated here.
Air line (approximately)
75 kilometers
40 nautical miles