The calculated distance (air line) between Neder-Hardinxveld and Purmerend is approximately 47 miles respectively 76 kilometers.
By car or train, the actual journey to Purmerend is certainly longer, as only the direct route (as the crow flies) between Neder-Hardinxveld and Purmerend has been calculated here.
Air line (approximately)
76 kilometers
41 nautical miles