Multiple choice

When it is 12.00 noon at Delhi (770 10' E), people at another place on earth take their 60'Clock morning tea. The longitude of that place is

  1. 170 30' E

  2. 12050 W'

  3. 1720 30' E

  4. 900 W
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Delhi is at 77°10' E. 6:00 AM is 6 hours behind 12:00 PM noon. Since Earth rotates 360° in 24 hours, each hour represents 15° of longitude (360/24 = 15). To go back 6 hours in time, we move 6 × 15 = 90° west. Starting from 77°10' E and moving 90° west gives 12°50' W. Option B shows 12°50' W (the formatting has the apostrophe misplaced but indicates the correct position).

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