The angle between the rhumb line
track and the great circle track is conversion angle which is half convergency.
Convergency = 14º so conversion angle =7º: great
circle track = 270º + 7º = 277º
Remember the question is asking for
the great circle track on arrival at B. The rhumb line track is 270ºT so great
circle = 270º + conversion angle = 270º + 7º = 277ºT. The great circle track at
A is 270º - 7º = 263ºT and the great circle track between A and B will change
by 14º (convergency).