What occurs twice in a week, once in a year but never in a day?

What is the Surname of Barbie Doll?

I have teeth but i don't bite. Who Am I ?

Replace the question mark in the picture below.

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

What country can make you shiver?

Why do you find that most of the buildings are deprived of the 13th floor?