Which number should replace the question mark?

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

There is a place where if I stand up straight, I will still be considered sideways.

A man dies of old age on his 25 birthday. How is this possible?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?