Question

Give geographical reasons

The standard time of India has been decided by the local time at 82.5 degree E longitude

Answer 1

It is the focal point everything being equal and longitudes of India.

As the neighborhood time contrasts by 4 minutes at each longitude, it would make a great deal of disarray seeing time for any nation all in all which may extend over a few longitudes.

Accordingly every nation chooses a focal meridian and the nearby time of this meridian is the standard time of that nation.