There will
always be some controversy over this issue of Vmp
being best ROC speed for a prop as it depends on which text book you read and
the interpretation of the position of the power available line which depends on
propeller efficiency.
In our
diagram on 5.8 we suggest that it is somewhere between Vmp
and Vmd.
As far as the
exam is concerned we must stick with the examiners interpretation which is that
Vmp gives best ROC speed for the prop.
Prop holding
speed is Vmp giving maximum endurance which in this question is 95kts