The calculated distance (air line) between Hendrik-Ido-Ambacht and Purmerend is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Purmerend is certainly longer, as only the direct route (as the crow flies) between Hendrik-Ido-Ambacht and Purmerend has been calculated here.
Air line (approximately)
77 kilometers
41 nautical miles