What word does this rebus represent?

meta meta
meta meta

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

Can you write down eight eights so that they add up to one thousand?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?