When monkey rotate the gear, which mark will be hit 1 or 2 ?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?