Question

What will be the time at 70 ⁰ E longitude when it is noon at Greenwich?​

Answer 1

At 90° E you have Russia (time zone here UTC+7), Mongolia and China (UTC+8), India (UTC+5:30) Bhutan and Bangladesh (UTC+6). So if it's noon there, the time could be 4:00 UTC, 5:00 UTC, 6:00 UTC or 6:30 UTC.

Now look at 70° W. Here you could be in the Canadian or US Eastern time zone (UTC-4 or UTC-5, depending on the time of the year), Colombia, Ecuador or Peru (UTC-5) or Chile (UTC-4). You narrowly miss Argentina (UTC-3).

So the local time at your destination longitude could be 23:00 the previous day, 0:00, 1:00, 1:30, 2:00 or, 2:30. Most definitely not 1:20.
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Answer 2

When it's noon at Greenwich, then, the time at 70° E is 4 Hours 40 Min.

1° = 4 Min

70*4 =280

280 Min in hours is 4Hours 40Minutes