Venus comes closer, but Jupiter has over ten times larger diameter. Venus approaches closer to the Earth than any other planet.
Closest approach is at inferior conjunction.
So, Venus looks larger than Jupiter in the sky. Numbers should speak to us, and a sense of magnitude can help us decide whether our answers are reasonable. If we think about the answers we get, and compare them to other things we know we can get a sense of how plausible our answer is. This is the maximum speed permissible by nature. Your speed of Jupiter is three orders of magnitude too large.