The calculated distance (air line) between Gan Yavne and Modiin Ilit is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Modiin Ilit is certainly longer, as only the direct route (as the crow flies) between Gan Yavne and Modiin Ilit has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles