If calculating the time difference between two longitude hours, what is indicated for the highest longitude?

When calculating the time difference related to longitude, every hour of longitude corresponds to a 15-degree segment of the Earth's rotation. The Earth rotates from west to east, so as you move eastward, the local time increases. Therefore, when you are determining the time indicated for the highest longitude, you consider the time zone that is ahead of UTC based on its position.

Thus, the time difference increases positively as you go to higher longitudes to the east of the prime meridian. Therefore, with higher longitude values eastward, the time indicated is positive relative to a reference point, such as Greenwich Mean Time (GMT). This is why the correct answer is that it is a positive value, reflecting the advancing local time as you move eastward in longitude.