The time in town X on longitude 15oE is 4.00 pm. What will be the time in town Y on longitude 15oW?

Analyze the question: Town X is at 15°E and town Y is at 15°W. We know the time at X and need the time at Y.

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

• 15° of longitude = 1 hour
• 1° of longitude = 4 minutes
• Places to the east are ahead in time (the sun rises there first).
• Places to the west are behind in time.

Solution:

1. Find the longitude difference. X is on 15°E and Y is on 15°W, so they are on opposite sides of the Prime Meridian: Difference = 15° + 15° = 30°

2. Convert to time: Time difference = 30° ÷ 15° per hour = 2 hours

3. Y is west of X, so Y is behind X: Time at Y = 4:00 pm − 2 hours = 2:00 pm

Answer: The correct option is **B. 2.

Tip: Remember "East is Eager (ahead), West is Wait (behind)." When the two places are on opposite sides of 0°, add the longitudes. When they are on the same side, subtract them. Then divide by 15 to get the hours.