The calculated distance (air line) between Kattivākkam and Nandambakkam is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Nandambakkam is certainly longer, as only the direct route (as the crow flies) between Kattivākkam and Nandambakkam has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles