Answer:
A metal snake that runs on tracks.
Never swallowed but certainly chewed, tossed in the mouth but it is not food. What is it?
If four people can repair four bicycles in four hours, how many bicycles can eight people repair in eight hours?
They live only in stories, taller than three storeys.
There are two monkeys on a tree and one jumps off. Why does the other monkey jump too?
What is round, has a twin, and sees more than most?