The calculated distance (air line) between Yehud and Rishon LeTsiyyon is approximately 7 miles respectively 12 kilometers.
By car or train, the actual journey to Rishon LeTsiyyon is certainly longer, as only the direct route (as the crow flies) between Yehud and Rishon LeTsiyyon has been calculated here.
Air line (approximately)
12 kilometers
6 nautical miles