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

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?

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

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

When, there is mid-day in the Greenwich, local time of a place is 5 O'clock evening. At which of the following longitude (meridians) that place will be located –

The time at Cairo is 2 hours ahead of Greenwich. Hence, it is located at-