Which number should replace the question mark?

Can you spot the man between the coffee bean in the picture below ?

It belongs to you, but other people use it more than you do. What is it?

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?

There are five people. One of them shot and killed one of the other five.
We know following clues:
1. Dan ran in the NY City Marathon yesterday with one of the innocent men.
2. Mike consider being a farmer before he moved to the city.
3. Jeff is a top notch computer consultant and wants to install Ben new computer next week.
4. The murderer had his leg amputated last month.
5. Ben met Jack for the first time six months ago.
6. Jack has been in seclusion since the crime.
7. Dan used to drink heavily.
8. Ben and Jeff built their last computers together.
9. The murderer is Jack's brother. They grew up together in Seattle.

Consider yourself to be a famous detective "Sherlock Homles", Can you find the killer?

Which famous Hollywood movie name is hidden in the below rebus?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Imagine you are in a room with no windows or doors. How will you get out?