Solve The below Equation:

ALFA + BETA + GAMA = DELTA

You can hear me, but you can't touch or see me.

What am I?

What is at the end of a rainbow?

What goes through cities and fields, but never moves?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

How can you take 2 from 5 and leave 4?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months