The calculated distance (air line) between Batu Gajah and Bukit Mertajam is approximately 73 miles respectively 118 kilometers.
By car or train, the actual journey to Bukit Mertajam is certainly longer, as only the direct route (as the crow flies) between Batu Gajah and Bukit Mertajam has been calculated here.
Air line (approximately)
118 kilometers
64 nautical miles