The calculated distance (air line) between Ālbū Kamāl and Tadmur is approximately 150 miles respectively 242 kilometers.
By car or train, the actual journey to Tadmur is certainly longer, as only the direct route (as the crow flies) between Ālbū Kamāl and Tadmur has been calculated here.
Air line (approximately)
242 kilometers
130 nautical miles