When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What is more useful when it is broken?

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

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

What you cannot hold but it is yours?

I have an eye but still cannot see.

Who am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?