Fun Riddles

Question: If 1+9+8=1, what is 2+8+9?

Question: What is bought by the yard by is worn by the foot?

Question: I'm measured in temperature and time, but have neither.

What am I?

Question: I build bridges of silver and crowns of gold.Who am I?

Question: A rat is placed at the beginning of a maze and must make it to the end. There are four paths at the start that he has an equal chance of taking: path A takes 5 minutes and leads to the end, path B takes 8 minutes and leads to the start, path C takes 3 minutes and leads to the end, and path D takes 2 minutes and leads to the start.

What is the expected amount of time it will take for the rat to finish the maze?