The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

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

How Come ??

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

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?