3: 60ºS 080ºW 2: 60ºS 070ºW
The great circle track at WP2 is less than 270ºT and at WP3 it is more than 270ºT.
It has increased by Conversion Angle = ChLong x sin mean lat
= 10ºx sin60º)
= 10º x 8.66 = 8.66º