The calculated distance (air line) between Rishon LeTsiyyon and Yavné is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Yavné is certainly longer, as only the direct route (as the crow flies) between Rishon LeTsiyyon and Yavné has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles