The calculated distance (air line) between Plankstadt and Bochum-Hordel is approximately 158 miles respectively 255 kilometers.
By car or train, the actual journey to Bochum-Hordel is certainly longer, as only the direct route (as the crow flies) between Plankstadt and Bochum-Hordel has been calculated here.
Air line (approximately)
255 kilometers
138 nautical miles