Which number should replace the question mark?

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?

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

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

What is common among 11, 69, and 88?

Which is heavier: a ton of bricks or a ton of feathers?

There was a blind beggar living on the footpath of a street. Suddenly one day, the beggar's brother died. What was the relation of the blind beggar with the person who died?

PS: Brother is not the answer.

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?