Answer:
Indian Standard Time: Indian Standard Time is the time observed by the whole country. The time along the Standard Meridian of India \[82{}^\circ 30'\]east is taken as standard time. We need a Standard Meridian because: (a) Standard Meridian is required to avoid difference in time within the country. (b) India has selected \[82{}^\circ 30'\]East Longitude as its Standard Meridian because it passes centrally through India, hence equidistant from east and west. (c) It is selected as Prime Meridian to avoid time lag of 2 hours from Arunachal Pradesh and Gujarat. Its time is the Indian Standard Time.
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