Greenwich Mean Time (GMT) is ________ Indian Standard Time (IST).
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 5.5 hours behind
Indian Standard Time is taken along 82½° E. Time changes by 4 minutes for every degree of longitude, so IST is \(82.5\times4=330\) minutes \(=5\) hours 30 minutes ahead of Greenwich; GMT is therefore 5.5 hours behind IST.