Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

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?

What country can make you shiver?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?