Question

What is the standard meridian of U. S. A

Answer 1

The U.S.A has 4 time zones :

Eastern Standard Time - It is 5 hours behind the Greenwich Meridian time. This time zone prevails in Newyork.
Central Standard Time - It is 6 hours behind the GMT. This time zone prevails in Chicago.
Mountain Standard Time- It is 7 hours behind the GMT.
Pacific Standard Time- It is 8 hours behind the GMT. This time zone prevails in Los Angeles.

Answer 2

There are 4 standard meridians in U.S.A.