What is the below Rebus indicate?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Can you find the key in the picture below?

How can one talk without saying a single word?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?