If it is 10.00 am. I.S.T., then what would be the local time at Shillong on 92° E longitude?
✓ Correct answer: b) 10.38 a.m.
ExplanationIndian Standard Time (IST) is calculated based on the 82.5°E longitude, which passes through Mirzapur, Uttar Pradesh.IST is 5 hours 30 minutes ahead of Greenwich Mean Time (GMT+5:30).Since the Earth rotates 360° in 24 hours, it covers 15° of longitude per hour which means that for every de- gree of longitude, there is a 4-minute difference in local time.Shillong is located at 92°E longitude, which is 9.5° east of the IST reference meridian.By multiplying this difference with 4 minutes per degree, we get a time difference of 9.5 × 4 = 38 min- utes.Since local time increases towards the east, Shillong will be 38 minutes ahead of IST.Therefore, if it is 10:00 AM IST then the local time in Shillong will be 10:38 AM.400
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