You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

What is so fragile that saying its name breaks it?

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

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

There is a circular car race track of 10km. There are two cars, Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100 m/seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5 hours all three stop moving.
What is the total distance covered by the bug?

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

Rearrange the letters in "new door" to make one word.