Concept:The Earth rotates eastward through 15∘ of longitude per hour, so locations east of Greenwich have a later local time.Explanation:Longitude difference between Greenwich and the given point is 30∘E.Time difference is calculated using 30∘÷15∘=2 hours.Since the place is to the east, add the time difference to GMT.Therefore, 10:00 a.m.+2 hours=12:00 p.m., which is noon.Answer:D. 12:00 p.m.