The cream is heavier than Milk. True or False?

What number should come in place of the question mark below?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

10+10 and 11+11 can give you the same answer.

Explain how?

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 ?

All of you like to eat me. I am a five-lettered word. Remove the first two and I turn into an infamous animal. Remove just the first and I become a heinous crime. Remove the first and the last and you can groove on me.

Can you guess who am I?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

The answer I give is yes, but what I mean is no. What was the question?