Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · LongitudeMedium · 45s
Q₂₉. If you travel westward from Greenwich to 90° W, you will:
TopicLongitude
Question Typemultiple choice
DifficultyMedium
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Explanation:90° × 4 min = 6 hrs behind → subtract.
Final Answer: Option B — Subtract 6 hours