The calculated distance (air line) between Yekaterinburg and Sredneuralsk is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Sredneuralsk is certainly longer, as only the direct route (as the crow flies) between Yekaterinburg and Sredneuralsk has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles