Fun Riddles

Question: I go up and I go down,
towards the sky and the ground.
I'm present and past tense too,
Let's go for a ride, me and you.

What am I?

Question: How do you share 34 apples among 33 people?

Question: There is a chain nailed to the wall. The chain is 10 feet long and the center of the chain dips down 5 feet from where each side of the chain is nailed to the wall. How far are the 2 ends of chain from each other?

Question: When do you go at red, but stop at green?

Question: A cowboy rode to an inn on Friday. He stayed two nights and left on Friday. How could that be?