When it is noon at IST meridian people at another place of the earth are taking 6 o 39 clock morning...........

Geography Shape and Motions of Earth

When it is noon at IST meridian, people at another place of the earth are taking 6 o' clock morning tea. The longitude of this place is

17 degree 30 minute east

7 degree 30 minute west

172 degree 30 minute east

90 degree west

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Explanation:

When it is noon i.e. 12.00 at IST , the local time at another palce is 6 AM. Thus the difference of time between these two places is 6 hours. Since difference of 1 degree longitude makes a difference of 4 minutes in local time, differnce of 6 hours makes a difference of 90 degree longitude. IST is based upon 82 degree 30 minute E longitude so the place will be 90 degree W of IST. Therefore the place is located at 90 degree-82 degree 30 minute = 7 degree 30 minute W.