Reasons for the time lag of 2 hours between Gujarat and Arunachal Pradesh:

1. Geographical Distance:
The primary reason for the time lag between Gujarat and Arunachal Pradesh is their significant geographical distance. The two states are located at opposite ends of India, with Gujarat in the westernmost part and Arunachal Pradesh in the northeastern part of the country. The time difference between the two states is due to the rotation of the Earth on its axis. As the Earth rotates from west to east, the areas towards the east experience sunrise earlier than those towards the west. Since Arunachal Pradesh is located further east, it experiences sunrise and daylight before Gujarat, resulting in a time lag.

2. Time Zones:
India has a total of five time zones based on its longitudinal extent. These time zones are implemented to ensure uniformity in time across the country. The standard time used in most parts of India is Indian Standard Time (IST), which is set at GMT+5:30. However, to account for the vast east-west distance, India has adjusted its time zones accordingly. Arunachal Pradesh falls under the Eastern Standard Time (EST) zone, which is GMT+5:30 plus an additional 30 minutes, making it GMT+6:00. On the other hand, Gujarat falls under the Western Standard Time (WST) zone, which is GMT+5:30 minus 30 minutes, making it GMT+5:00. This time zone difference of one hour contributes to the 2-hour time lag between Gujarat and Arunachal Pradesh.

3. Administrative Decisions:
The time zones in India are not solely determined by geographical considerations but are also influenced by administrative decisions. The Indian government, taking into account various factors such as transportation, communication, and administrative efficiency, decides the time zones for different regions. These decisions aim to optimize the functioning of government offices, businesses, and other activities. The time lag between Gujarat and Arunachal Pradesh is a result of such administrative decisions.

In conclusion, the time lag of 2 hours between Gujarat and Arunachal Pradesh is mainly due to their large geographical distance, the implementation of different time zones, and administrative decisions made by the Indian government. These factors together create a time difference that allows for efficient functioning and coordination across the country.