Using Only Five 5's and any mathematical operator make sum as 37

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

When is the top of a mountain similar to a savings account?

Can you move 2 matchsticks to form four equal sized squares.

What will you call your mother's brother's brother-in-law?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

It belongs to you, but other people use it more than you do. What is it?