When it is 10.00 AM on 0° longitude, what time will it be at 15° east longitude ?

Question

Accepted Answer

Explanation:

1. **Why Option 1 is Correct (11.00 AM):**

The Earth is divided into 360 degrees of longitude, and it rotates 360 degrees in 24 hours. This means that for every 15 degrees of longitude, there is a time difference of 1 hour. When it is 10.00 AM at 0° longitude (the Prime Meridian), moving eastward to 15° east longitude results in a time advancement of 1 hour. Therefore, the time at 15° east longitude would be 11.00 AM. This is why Option 1 is correct.

2. **Why the Other Options are Incorrect:**

- **Option 2 (11.00 PM):** This option is incorrect because it suggests a 13-hour difference instead of a 1-hour difference. Moving 15° east from 0° longitude results in a 1-hour advancement, not a 13-hour change.

- **Option 3 (10.15 AM):** This option is incorrect because it implies a 15-minute difference. The Earth’s rotation causes a 1-hour difference for every 15 degrees of longitude, not 15 minutes. Therefore, 10.15 AM is not the correct time at 15° east longitude.

- **Option 4 (09.45 AM):** This option is incorrect because it suggests a time that is 15 minutes earlier than 10.00 AM. Moving eastward from 0° longitude should result in a time advancement, not a regression. Hence, 09.45 AM is not the correct time at 15° east longitude.

In conclusion, based on the Earth's rotation and the division of time zones, Option 1 (11.00 AM) is the correct answer when it is 10.00 AM at 0° longitude and you move to 15° east longitude.