Why do people go to bed?

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

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Can you solve the photo plexer logic ?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?