Explanation:

Time Zones
- Earth is divided into 24 time zones, each 15 degrees of longitude wide.
- Each time zone is one hour ahead or behind the next.
- The Prime Meridian (0° longitude) passes through Greenwich, England and is the starting point for measuring longitude.
- India lies between 68°7'E and 97°25'E longitude and is covered by only one time zone.

Sunrise Time
- Sunrise time depends on the longitude of the place.
- The sun rises in the east and sets in the west.
- The earth rotates from west to east, so places to the east see the sun before places to the west.

Arunachal Pradesh and Gujarat
- Arunachal Pradesh is located in the northeastern part of India, while Gujarat is located in the western part of India.
- Arunachal Pradesh is at a higher longitude than Gujarat, so the sun rises earlier there.
- However, both states follow the same time zone, which is Indian Standard Time (IST), based on the longitude of Allahabad (82.5°E).
- This means that the clock time is the same in both states, even though the sun rises earlier in Arunachal Pradesh.

Reason for Same Time
- India follows a single time zone for the entire country.
- This is because having multiple time zones would create confusion and inconvenience for transportation, communication and other activities.
- The government of India has decided to follow a single time zone to avoid these problems.
- As a result, the people of Arunachal Pradesh have to adjust to the clock time, even though the sun rises earlier in their state.

Conclusion:
In conclusion, the sun rises two hours earlier in Arunachal Pradesh as compared to Gujarat in the west due to the difference in longitude, but both states follow the same time zone, which is Indian Standard Time (IST). This is because India has decided to follow a single time zone for the entire country to avoid confusion and inconvenience.