Count the number of lines in the image below ?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

What can go up a chimney down, but can’t go down a chimney up?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

I am the fastest animal but cannot climb the tree. What am I?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

How can you take 2 from 5 and leave 4?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?