Answer:
From
Gujarat to Arunachal Pradesh there is a time lag of two hours. Hence, time
along the Standard Meridian of India (82° 30' E) passing through Mirzapur (in
Uttar Pradesh) is taken as the standard time for the whole country. Otherwise
different regions of India would have different times, which would create
problems; so, to have one common standard time for the whole country, this has
been selected and called Indian Standard Time (1ST).
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