Question

if it is 12 noon at 60 degree east then explain what would be the time at 30 degree West longitude

Answer 1

69 Deg means 69*4=276 min, East means time will be added. 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.

12 deg means 12*4=48 min, East means time will be added. 12 noon in Greenwich means 12 deg east will be 12 + 48 min = 12:48 pm.