Can you replace the question mark with the correct number?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?

There was a strange boy who was born before his father. How can this be possible?

People put me on the table and cut me but do not eat me. What am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

There is something which you can be arrested for attempting but not for successfully completing.

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?