Which is faster, Heat or Cold ? Explain.

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What has to be broken before you can use it?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

why number 8549176320 is one of a kind?

What number do you get when you multiply all of the numbers on a telephone's number pad?