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?

The dirtier I get, the whiter I look. Who am I?

I am white when I am dirty, and black when I am clean. What am I?

If six children and two dogs were under an umbrella, how come none of them got wet?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

The more of this there is, the less you see. What is it?

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

Why 1729 is a magic number? Answer Logically.

If eleven plus two equals one, what does nine plus five equal?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?