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

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

What is the fastest way to double your money?

Can you write down eight eights so that they add up to one thousand?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

What seven-letter word has hundreds of letters in it?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.