If the earths direction of rotation is reversed, what would be the IST when it is noon at the International Date Line ?

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Q: 64 (IAS/1997)
If the earth’s direction of rotation is reversed, what would be the IST when it is noon at the International Date Line ?

question_subject: 

Geography

question_exam: 

IAS

stats: 

0,34,123,52,51,34,20

keywords: 

{'international date line': [2, 1, 5, 1], 'noon': [0, 0, 4, 2], 'rotation': [1, 0, 0, 2], 'ist': [0, 1, 2, 1]}
If the earth’s direction of rotation is reversed, the IST (Indian Standard Time) when it is noon at the International Date Line would be 18.30 hrs (Option 3). This is because, currently, IST is 5 hours and 30 minutes ahead of the International Date Line, which is located at 180° longitude. So, when it is noon at the International Date Line, it is 5:30 AM in India. However, if the direction of rotation is reversed, the time difference would be subtracted instead of added, resulting in a time difference of 18 hours and 30 minutes.