What does below Rebus say?

XLR8

Which is faster, Heat or Cold ? Explain.

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

What can you hold in your right hand, but never in your left hand?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.