Give Jupiter's radius in units of Earth diameters, where the diameter of Earth is 12800 km. The diameter of Jupiter = its speed X its occultation time: Diameter= 13.1 km/s x 3 x 3600 seconds = 141500 km. In terms of Earth diameters: D (jupiter)= 141500 km. x (earth diameter/12800 km) = 11 earth diameters.