Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

what does the below rebus means?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

A father's child, a mother's child, yet no one's son.

Who am I?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Take one out and scratch my head, I am now black but once was red. What am I?

Which number comes next in the number series?

2, 9, 30, 93, ?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?