What number should come in place of the question mark below?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

What's the only room from which no one can enter or leave

Replace the question mark with the correct number below.

There are two insects on a tile. Insect X is sitting on one side of the tile (point A) and Insect Y is sitting opposite on the other side of the tile (point B). Now both of them decide to change their position and thus X starts crawling to point B and Y starts crawling to point A. When they meet and pass each other in between, X takes 20 seconds to reach B and Y takes just 5 seconds to reach A.

Can you calculate the total time each of the insects took to change their positions?

You need to arrange three 7 and mathematical symbols to form number 1?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?