Which Travels Faster? Solve below famous picture riddle:

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

When it is alive we sing, when it is dead we clap our hands. What is it?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?