The calculated distance (air line) between Voronezh and Nizhnedevitsk is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Nizhnedevitsk is certainly longer, as only the direct route (as the crow flies) between Voronezh and Nizhnedevitsk has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles