I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

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.

Which is the rope you never skip with?

Why despite killing dozens of people Charley and Wilma were not punished?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

The dirtier I get, the whiter I look. Who am I?

If two's company, and three's a crowd, then whats four and five ?