The Brain Teaser (Answers on page 22)

1. If five spiders can catch five flies in five minutes, how many spiders are required to catch a hundred flies in a hundred minutes?
   
2. A clock strikes six in five seconds. How long does it take to strike twelve?
   
3. A man rode into town on Friday, stayed for three days and three nights and then rode out, again on Friday. How could this be possible?