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