The calculated distance (air line) between Ādīs Zemen and Debre Tabor is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Debre Tabor is certainly longer, as only the direct route (as the crow flies) between Ādīs Zemen and Debre Tabor has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles