The calculated distance (air line) between Giv'at Shmuel and Reẖovot is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Reẖovot is certainly longer, as only the direct route (as the crow flies) between Giv'at Shmuel and Reẖovot has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles