Good Riddles

Question: A shrimping boat is at the docks with a lifeboat hanging off the side 5 meters above the water. If the tides rise at a rate of 1.5 meters per hour, how long would it take for the water to reach the lifeboat.

Question: Four cars come to a four way stop, all coming from a different direction. They can't decide who got there first, so they all go forward at the same time. They do not crash into each other, but all four cars go. How is this possible?

Question: New York In the The Spring What is wrong here?

Question: You will always find me in the past. I can be created in the present, But the future can never taint me. What am I?

Question: There are 20 birds in a tree. A man comes and shoots one of the birds. How many birds are left?