There was an aeroplane crash, every single person died, but two people survived. How is this possible?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

There was a strange boy who was born before his father. How can this be possible?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

You need to arrange three 7 and mathematical symbols to form number 1?

John was piloting a plane behind a car but was never able to overtake it. Why?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?