Question:
How many minutes does local time vary per degree of longitude from Greenwich time?
How many minutes does local time vary per degree of longitude from Greenwich time?
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Remember two anchors: \(\boxed{1^\circ = 4 \text{ min}},\ \boxed{15^\circ = 1 \text{ hour}}\).
Updated On: Aug 12, 2025
- Four minutes
- Two minutes
- Eight minutes
- Ten minutes
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The Correct Option is A
Solution and Explanation
Derivation: Earth completes \(360^\circ\) in \(24\) hours \(= 1440\) minutes. Time per degree \(= 1440/360 = 4\) minutes. Thus a place at \(75^\circ\)E is \(75 \times 4 = 300\) minutes \(= 5\) hours ahead of Greenwich (hence IST at \(82.5^\circ\)E is \(5.5\) hours ahead).
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