There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What has a ring but no finger?

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?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Replace the question mark with the correct number below.

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

My location can be determined by the below rebus.
So where am i ?

John was piloting a plane behind a car but was never able to overtake it. Why?

Why is a river so rich ?