What goes through cities and fields, but never moves?

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

The more of this there is, the less you see. What is it?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

The dirtier I get, the whiter I look. Who am I?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Solve this riddle by finding the odd one out from the rest.

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

What number comes next in this sequence:
7 8 5 5 3 4 4 _