Since the answers are already posted, I just wanna complain about the first question. 42 is the answer to the ultimate question of life, the universe and everything. It is not the meaning of life the universe and everything. This is a referential joke made by people who never read the books or even paid close attention to the movie and it is so annoying to me. It also eclipses the greater joke which it is supposed to be apart of, that is, that the answer and the ultimate question cannot both be known in the same universe, lest that universe cease to exist and be replaced by an even more bizarre and inexplicable one; some people think this has already happened.
Done complaining. Sorry.