The calculated distance (air line) between Tvarditsa and Veliko Tŭrnovo is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Tvarditsa and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles