The calculated distance (air line) between Jenjarum and Bukit Mertajam is approximately 186 miles respectively 300 kilometers.
By car or train, the actual journey to Bukit Mertajam is certainly longer, as only the direct route (as the crow flies) between Jenjarum and Bukit Mertajam has been calculated here.
Air line (approximately)
300 kilometers
162 nautical miles