Question

What is Prime Meridian of India and write its value.

Answer 1

Indian Standard Time (IST) is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. India does not observe daylight saving time (DST) or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star")

Indian Standard Time is calculated on the basis of 82.30' E longitude, in Shankargarh Fort, Mirzapur (25.15°N 82.58°E) (in Mirzapur district in the state of Uttar Pradesh) which is nearly on the corresponding longitude reference line.
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Answer 2

Here u r. The value is 82.5