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

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

If it is 12 noon in New Delhi, what will be the time in London, UK?

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

If it is 12.00 Noon in India, on which meridian wil it be 7.00 am of the same day?

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