The calculated distance (air line) between Bochum-Hordel and Slikkerveer is approximately 113 miles respectively 182 kilometers.
By car or train, the actual journey to Slikkerveer is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Slikkerveer has been calculated here.
Air line (approximately)
182 kilometers
98 nautical miles