It would be a close race until near the end. The Batmobile would begin to pull ahead to what would seem like certain victory, at which time, Speed Racer would :
A.) push a button
B.) remember the lesson that Pops tried to teach him yesterday, or
C.) look over his shoulder and see Racer X closing in on the Batmobile.
One or any combination of these events would cause the Batmobile to spin wildly out of control, leaving Batman standing by the side of the road shaking his fist, choking on dust and vowing revenge, and opening the way for yet another dramatic victory for the world's greatest racer.
Of course, all this would depend on who's TV show it was. Batman's TV show would probably have a different outcome.
David G.