What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

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?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

It is always ahead of me yet I can never see it. What is it?

Why are all black people so quick ?

Why is 6 afraid of 7?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Three people check into a hotel. They pay $60 for the rent of the room. After they check-in, the manager realize that the rent for the room is $55. So, he gives $5 to the bellboy and asks him to give it to them. The bellboy thinks that it will be difficult for the three people to share $5 among them and seeking the personal benefit, he pockets $2 and gives the remaining $3 to them.

Now, each person paid $20 and got back $1. In this manner, each of them paid just $19 which totals to the amount of $57. The bellboy has $2 with him and adding them, we get $59. So where is the remaining $1?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?