The calculated distance (air line) between Puyang Chengguanzhen and Daokou is approximately 30 miles respectively 49 kilometers.
By car or train, the actual journey to Daokou is certainly longer, as only the direct route (as the crow flies) between Puyang Chengguanzhen and Daokou has been calculated here.
Air line (approximately)
49 kilometers
26 nautical miles