The calculated distance (air line) between Barmbek-Nord and Braunschweig is approximately 95 miles respectively 152 kilometers.
By car or train, the actual journey to Braunschweig is certainly longer, as only the direct route (as the crow flies) between Barmbek-Nord and Braunschweig has been calculated here.
Air line (approximately)
152 kilometers
82 nautical miles