The calculated distance (air line) between Bochum-Hordel and Rüsselsheim is approximately 118 miles respectively 190 kilometers.
By car or train, the actual journey to Rüsselsheim is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Rüsselsheim has been calculated here.
Air line (approximately)
190 kilometers
102 nautical miles