Good Riddles

Question: It takes ten men ten hours to build a certain wall. How long does it take five men to build the same wall?

Question: I'm not a pool, a tree, a slave, a website, or a shirt.

What am I?

Question: A smart landscaper is given the task of placing 4 trees so that they are all the same distant away from each other.

How does he do this?

Question: How many letters are in the answer to this riddle?

Question: A baseball pitcher plays during 9 innings, gets 27 strike outs, and only throws 81 pitches. But they still lose 1-0 to the other team.

How is this possible?