The calculated distance (air line) between Ngaruawahia and Papatoetoe is approximately 51 miles respectively 83 kilometers.
By car or train, the actual journey to Papatoetoe is certainly longer, as only the direct route (as the crow flies) between Ngaruawahia and Papatoetoe has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles