The calculated distance (air line) between Tarinkot and Lashkar Gāh is approximately 114 miles respectively 183 kilometers.
By car or train, the actual journey to Lashkar Gāh is certainly longer, as only the direct route (as the crow flies) between Tarinkot and Lashkar Gāh has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles