French Police inspects a room where there are no windows, no doors, no tables and is almost empty expect there is just a puddle of water. They found a dead man who obviously hung herself from the ceiling, but they are not able to figure out how this had happened.

John and Jacob entered the crime scene and easily able to solve the case.

How did the man die?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Can you solve the maths in the below-given picture equation?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What has a bottom at the top?

What happened when the wheel was invented?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

What demands an answer, but asks no questions

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?