How does the solar noon vary with every 15 degrees of longitude east of a given longitude?

How does the solar noon vary with every 15 degrees of longitude east of a given longitude? Correct Answer Solar noon occurs one hour earlier with every 15 degrees of longitude east of a given longitude

Solar noon varies with longitude but it is important to mention the reference longitude for correct calculation. It occurs one hour late with every 15 degrees of longitude east of a given longitude. This can be used to estimate the time of different regions.

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How does the solar noon vary with every 15 degrees of longitude west of a given longitude?
When it is noon along 82° 30' longitude, along what degree of longitude it will be 6.30 a.m.?