Indian Standard Time is ahead of Greenwich Mean Time by:

Correct option is D

The correct answer is (D) 5 hours and 30 minutes.

Explanation:

• Indian Standard Time (IST) is ahead of Greenwich Mean Time (GMT) by 5 hours and 30 minutes.

Information Booster:

• Indian Standard Time (IST) is used across India and Sri Lanka.
• Greenwich Mean Time (GMT) is the time at the Royal Observatory in Greenwich, London.

Key Points:

• IST passes through the Indian subcontinent, specifically through India and Sri Lanka. The IST meridian is located at 82.5° East.
• The Greenwich Meridian (0° longitude) passes through Greenwich in London, United Kingdom.