If Greenwich Meridian Time is 12 noon, then what will be the time at 45° East longitude?

Correct option is C

The correct answer is 3 p.m. because the Earth is divided into 24 time zones, each covering 15 degrees of longitude. For every 15 degrees east of the Prime Meridian (Greenwich), the local time increases by one hour. Since 45° East is 3 time zones (45° ÷ 15° = 3) ahead of the Prime Meridian, the time at 45° East would be 3 hours ahead of GMT (Greenwich Mean Time). Therefore, if it is noon at GMT, it would be 3 p.m. at 45° East.

Information Booster:

·       Earth’s rotation: The Earth rotates 360° in 24 hours, which means it rotates 15° every hour.

·       Time zones: Each 15° of longitude represents one hour's difference in local time.

·       45° East longitude: Being 45° east of the Prime Meridian, the time is 3 hours ahead of GMT.

·       Greenwich Mean Time (GMT): The reference point for calculating time zones worldwide.

·       Calculation: 45° ÷ 15° = 3 hours ahead of GMT.

Additional Knowledge:

·       Prime Meridian (GMT): The Prime Meridian is located at 0° longitude, passing through Greenwich, England. GMT serves as the baseline for calculating time zones globally.

·       45° East longitude: This longitude line passes through various countries like Russia and Turkey. Since it lies to the east of the Prime Meridian, the local time is ahead of GMT.

·       Time difference: Each degree of longitude corresponds to a 4-minute time difference (360° ÷ 24 hours = 15° per hour, or 4 minutes per degree). Therefore, 45° corresponds to a time difference of 3 hours.

·       East vs. West: Moving east from the Prime Meridian adds time, while moving west subtracts time. For example, at 45° West, the time would be 3 hours behind GMT.