The sun rises two hours earlier in Arunachal Pradesh as compared to Gujarat in the west but the watches show the same time. How does this happen?

India lies between 68°7'E and 97°25'E, making a 28° difference from extreme west (Gujarat) to extreme east (Arunachal Pradesh) of the country. The Earth rotates 360° in 24 hours, i.e., it moves 1° in 4 minutes. Thus, for moving 28° the earth takes 28 x 4 i.e., about 2 hours. As a result, the Sun rises 2 hours earlier in Arunachal Pradesh compared to Gujarat. However, both regions use the same time because they follow the standard time of India, which is set along the Standard meridian of India (82°30'E).