Question

The local time at 50°E longitude is 11 AM. What will be the local time at 10°E longitude?

Answer 1

The Earth rotates 360° in 24 hours, so for each degree of longitude, the local time changes by 4 minutes. The difference between 50°E and 10°E is 40°. Since 10°E is west of 50°E, the local time there will be earlier by 40° × 4 minutes = 160 minutes, which is 2 hours 40 minutes earlier. Therefore, if the local time at 50°E longitude is 11 AM, the local time at 10°E longitude will be 8:20 AM.