The calculated distance (air line) between Stary Krym and Gresovskiy is approximately 52 miles respectively 84 kilometers.
By car or train, the actual journey to Gresovskiy is certainly longer, as only the direct route (as the crow flies) between Stary Krym and Gresovskiy has been calculated here.
Air line (approximately)
84 kilometers
45 nautical miles