Which is faster, Heat or Cold ? Explain.

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What month of the year has 28 days?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

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 five people. One of them shot and killed one of the other five.
We know following clues:
1. Dan ran in the NY City Marathon yesterday with one of the innocent men.
2. Mike consider being a farmer before he moved to the city.
3. Jeff is a top notch computer consultant and wants to install Ben new computer next week.
4. The murderer had his leg amputated last month.
5. Ben met Jack for the first time six months ago.
6. Jack has been in seclusion since the crime.
7. Dan used to drink heavily.
8. Ben and Jeff built their last computers together.
9. The murderer is Jack's brother. They grew up together in Seattle.

Consider yourself to be a famous detective "Sherlock Homles", Can you find the killer?

I am white when I am dirty, and black when I am clean. What am I?

I add 5 to 9 and get 2. The answer is correct, so what am I?