Why Aeroplane windows are round?

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

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

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

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

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?