Re-read that section, Arkhandus. It says "speed per ROUND", so you'd have to divide by two if you want speed per move action (2 move actions per round). It works out the same if you do the math : with one round equalling 6 second you get 10 MPH = 90 feet per round, total.10 MPH is the move-action speed for the Speed power at rank 1, which Bob has. That's 100 feet in a move action (at least by the simple calculation given in M&M; the precise one requires a calculator).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.