Saturn's largest ring was discovered in 2009 with the Spitzer infrared space telescope. It stretches from 7.45 million km to 12.1 million km from the centre of Saturn. Saturn's mass is 5.683 x 10% kg. Calculate the orbital period of a rock on an orbit with perikrone distance 7.45 million km and apokrone distance 12.1 million km. Enter the period in days with 3 significant digits. Use that one day has 24 x 3600 = 86400 seconds