Replace the question mark with the number below given a simple math problem.

If a wheel has 54 spokes, how many spaces are there between the spokes?

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 ?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Take away the whole and some still remain. What is it?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

I look at you, you look at me, I raise my right, you raise your left. What am I?

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?