The calculated distance (air line) between Rūdbār and Lashkar Gāh is approximately 145 miles respectively 233 kilometers.
By car or train, the actual journey to Lashkar Gāh is certainly longer, as only the direct route (as the crow flies) between Rūdbār and Lashkar Gāh has been calculated here.
Air line (approximately)
233 kilometers
126 nautical miles