The problem with these definitions that I have is that there appears to be a contradiction.
If one operates at best climb rate speed then cruise is acheived in the shortest possible time. However, distance is a function of speed and time and if we just took the shortest time to get up to 390 then it seems sensible to me that we have traveled a short distance.
How a shorter distance can be acheived with best angle of climb speed evades me.
Further clarification appreciated