Re:
Easy, have a play yourself:
http://www.kreuzotter.de/english/espeed.htm
On the drops position (0.34 CdA), -10* slope (for argument's sake, leaving all the rest as defaults)
360w = 77.4kmh
400w = 78.1kmh
600w = 81.3kmh
360w with triathlon position (0.28 CdA) = 84.3kmh
The point is, that...