What does this below rebus puzzle mean?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

What is the next number in the series?

15 29 56 108 208 ?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?