Question

Why the countries of the world selected their own standard meridians?

Answer 1

The countries of the world can select their own standard meridian else there will be lots of problems arising from transportation to communication and for each and everything.

If each and every state, try to follow their own time then everything gets collapsed on each other without standard time.

Then there will be nothing in the proper schedule from communication to transport and also our daily routine.

Answer 2

Different places in a country have different local times which can create problem so to avoid confusion and have a standard reference time countries of the world choose their own standard meridian