The calculated distance (air line) between Haibara-akanedai and Hamamatsu is approximately 102 miles respectively 164 kilometers.
By car or train, the actual journey to Hamamatsu is certainly longer, as only the direct route (as the crow flies) between Haibara-akanedai and Hamamatsu has been calculated here.
Air line (approximately)
164 kilometers
89 nautical miles