The answer for 3 question is 
A 24-hour difference is observed for a rotation through 360°.
So for a difference of 30° – (–75°) = 105° will give a difference of 24×105/360 = 7 hours.

So according to calculations, the difference should be of 7 hours. Since the earth moves from west towards east, the difference shall be positive going east. So, it should be 0700 + 0700 = 1400 hours on the same date in Durban.

i only knw that one