Town A is located on longitude 15°E, while town B is located on longitude 45°E. If the local time in town A is 6.00am, what will be the local time in town B?

Analyze the question: Two towns lie on different longitudes. We know the local time at A and need the local time at B.

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

• 360° ÷ 24 hours = 15° per hour
• 1° = 4 minutes
• Places to the east are ahead in time (the sun rises there first), so you add time going east.
• Places to the west are behind, so you subtract time going west.

Solution:

1. Difference in longitude = 45°E − 15°E = 30°
2. Time difference = 30° ÷ 15° per hour = 2 hours
3. Town B is east of Town A, so it is ahead: Local time at B = 6:00 am + 2 hours = 8:00 am

Answer: Option D, 8.00am.

Tip: Remember "East is Earlier in the day, so Add" (East = Add, West = Waste/Subtract). Always begin by finding the longitude difference. If both places are on the same side of the Greenwich Meridian (both E or both W), subtract the longitudes. If they are on opposite sides, add them.