The calculated distance (air line) between Primorskiy and Shchyolkino is approximately 28 miles respectively 44 kilometers.
By car or train, the actual journey to Shchyolkino is certainly longer, as only the direct route (as the crow flies) between Primorskiy and Shchyolkino has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles