Calculate the time at 30° East and 30° West longitudes if it is 12 noon in at Greenwich.
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12 Noon at Greenwich means 69 deg east will be 12 + 4 hr 36 min (276 min) = 4:36 pm. 30 deg means 30*4=120 min, West means time will be subtracted. 12 noon in Greenwich means 30 deg west will be 12 - 2 hr (12 min) = 10 am.
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