The calculated distance (air line) between Ruse and Veliko Tŭrnovo is approximately 55 miles respectively 89 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Ruse and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
89 kilometers
48 nautical miles