The calculated distance (air line) between Telaga Batu and Bukit Mertajam is approximately 18 miles respectively 28 kilometers.
By car or train, the actual journey to Bukit Mertajam is certainly longer, as only the direct route (as the crow flies) between Telaga Batu and Bukit Mertajam has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles