Can you name some countries which do not have the alphabet 'A' in them?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

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?

What building has the most stories?

What has one letter and starts with an E?

What jumps when it walks and sits when it stands?

How far can you walk into the woods?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What is the largest number you can write with just 3 digits?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?