The calculated distance (air line) between Kafr Takhārīm and Tadmur is approximately 147 miles respectively 236 kilometers.
By car or train, the actual journey to Tadmur is certainly longer, as only the direct route (as the crow flies) between Kafr Takhārīm and Tadmur has been calculated here.
Air line (approximately)
236 kilometers
127 nautical miles