The calculated distance (air line) between Bungo-Takada-shi and Hiroshima is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Hiroshima is certainly longer, as only the direct route (as the crow flies) between Bungo-Takada-shi and Hiroshima has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles