How is the moon similar to a dollar?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

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?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Why is the Hole below a Lock?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?