Answer:
India extends from \[68{}^\circ TE\] and \[97{}^\circ 2S'E\]longitudes. There is difference of \[29{}^\circ \]between eastern and western extremes of India. (a) For every \[15{}^\circ \]of longitudinal difference, there is corresponding time difference of I hour. As a result of this variation, Arunachal Pradesh is nearly 2 hours ahead of Gujarat in local time. In order to avoid this difference of 2 hours, \[82{}^\circ 30'E\]longitude has been selected as Prime Meridian for Indian standard time.
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