Decode below three cipher riddles:

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

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

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

what's the probability of getting a king or a queen from a pack of 52 cards?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

What has no start, end, or centre?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?