Saturn is 1.4 times 10^9, while Venus is 1.1 times 10^8.
Saturn- 1.4 times 1,000,000,000= 1,400,000,000
Venus- 1.1 times 100,000,000= 110,000,000
You can see that Saturn is further away from this, and now all you have to do is subtract Venus' distance from Saturn's.
1,400,000,000-110,000,000
=1,290,000,000
Now you need to put this in scientific notation.
1.29 times 10^9