What is harder to catch the faster you run?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

Which alphabet letter is a question?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Using Only Five 5's and any mathematical operator make sum as 37