Sorry I think you messed up something here. If computer A can only compute 333 positions while pondering, this assumes computer B (3x accelerated) pulled after 10 secs - this hands over the turn to play to comp. A and stops prematurely A's pondering phase. Yet over these 10 secs B computed "only" 1000 positions, not 3000.
Another way to say it is: if comp. B 3 times accelerated benefits from 3000 computed positions per move, while comp. A features only 1000 per 30 secs, this means comp. B requires 30s per move as well (to reach 3000 positions). Then comp. A can use 30s pondering while B computes...

Kind regards,
Eric