The calculated distance (air line) between Castrop-Rauxel and Ennepetal is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Ennepetal is certainly longer, as only the direct route (as the crow flies) between Castrop-Rauxel and Ennepetal has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles