The Indian Standard Time (IST) is
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5 1/2 Hrs + GMT
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5 1/2 Hrs - GMT
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6 Hrs + GMT
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6 Hrs - GMT
A
Correct answer
Explanation
IST is 5 hours 30 minutes ahead of Greenwich Mean Time (GMT). When it is noon in London, it is 5:30 PM in India. This offset is due to India's central longitude being 82.5°E, which is 5.5 hours ahead of the Prime Meridian.