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?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Identify the hidden meaning behind this picture?

Which alphabet letter is a question?

Can you count the number of squares in the figure below?

What makes this number unique: 8,549,176,320?

I know a nine-letter word having only one vowel.
Do you ?

What is the next shape from answers A, B, C, and D figure?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.