The calculated distance (air line) between Mek'ele and Ādīs Zemen is approximately 149 miles respectively 239 kilometers.
By car or train, the actual journey to Ādīs Zemen is certainly longer, as only the direct route (as the crow flies) between Mek'ele and Ādīs Zemen has been calculated here.
Air line (approximately)
239 kilometers
129 nautical miles