The calculated distance (air line) between Bochum-Hordel and Bergkamen is approximately 22 miles respectively 35 kilometers.
By car or train, the actual journey to Bergkamen is certainly longer, as only the direct route (as the crow flies) between Bochum-Hordel and Bergkamen has been calculated here.
Air line (approximately)
35 kilometers
19 nautical miles