Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
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Q · LongitudeMedium · 45s
Statement:If it is 12 noon at Greenwich, what would be the local time at 90° East longitude?
TopicLongitude
Question Typemultiple choice
DifficultyMedium
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Explanation:Difference = 90° × 4 min = 360 min = 6 hours ahead. So, local time is 6 PM.
Final Answer: Option B — 6 PM