The longitude based on the time difference is 15 degrees.
The longitude of a complete rotation of the earth in a 24 hours is calculated as follows;
[tex]= \frac{360^0}{24} = 15^0 \ of \ longitude[/tex]
The time difference between the local apparent solar time and the Greenwich time is calculated as follows;
[tex]t = 12 pm \ - \ 11 am\\\\t = 1 \ hour[/tex]
Since it is one hour time difference, the longitude is 15 degrees.
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