You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

When 99 is considered higher than 100?

If 21x = 79x, what is the value of x?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

With the help clues provided in the image, can you find the 5 digit key?

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?