What is the local time in Town X at 45° E, when it is noon at 0°?

Analyze the question: Town X is at longitude 45° E. When it is noon at the Prime Meridian (0°), what is the time at 45° E?

Concept: The Earth rotates 360° in 24 hours, so:

• 360° ÷ 24 hours = 15° per hour, which is 4 minutes per degree
• Places east of Greenwich are ahead in time (the sun rises earlier there), so you add time.
• Places west of Greenwich are behind, so you subtract time.

Solution:

1. Longitude difference = 45° − 0° = 45°
2. Time difference = 45° ÷ 15° per hour = 3 hours
3. Town X is east of 0°, so it is 3 hours ahead.
4. Local time = 12:00 noon + 3 hours = 3:00 pm

Answer: Option C, 3.00 pm.

Tip: Remember "East is Early (ahead), West is Wasted (behind)", or "ETA: East, Time Add". First divide the longitude by 15 to get the hours, then add if the place is east and subtract if it is west. Always check that your answer makes sense: 3.00 pm is later than noon, which fits a place to the east.