People make me, save me, change me, raise me. What am I?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Why 1729 is a magic number? Answer Logically.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

I don't get anymore wetter, no matter how much rain falls on me.

What is the riddle which can be asked all day with a different correct answer each time.

What is the difference between a jeweller and a jailer?

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.

How many times can you subtract the number two from the number fifty?

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