If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be the time at 90° E longitude?

The local time of a place is 6.00 AM when the Greenwich Mean Time (GMT) is 3:00 AM, what is the longitude of the place?

If it is 10.00 A.M. IST, then what would be the local time at Shillong at 92° E longitude?

What is the local time of Thimphu (Bhutan) located at 90° East longitude when the time at Greenwich (0°) is 12:00 noon?

What would be the time at 30º East of Greenwich, if it is 12 noon at Greenwich?

When it is noon along 82° 30’ E longitude along what° of longitude it will be 6.30 a.m.?