Find out the missing number in the picture attached:

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

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 is common among 11, 69, and 88?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

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

Mother's Name is Mrs. SIXTY TWO
Son's Name is FIFTY TWO
Daughter's Name is FORTY TWO
What is Name of Father?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?