The calculated distance (air line) between Bochum-Hordel and Boskoop is approximately 115 miles respectively 185 kilometers.
By car or train, the actual journey to Boskoop is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Boskoop has been calculated here.
Air line (approximately)
185 kilometers
100 nautical miles