Ok so I was exaggerating
Listen to Matt, he was one of our scouters and he had the stopwatch.
Though I remember watching them one time and it really looked like it only took them one second to get there...
Also in your calculations you are assuming they accelerate the entire time when really most robots can reach max speed in 2-3 feet. So doing some calculations, to reach 20 ft/s in 3 ft thats an acceleration of 66.7 ft/s/s and takes .3 s, then to reach the goal at 20 ft/s that is now 22 ft away takes 1.1 s. In total thats about 1.4 s. Now I really do think they can go 20 ft/s at their max maybe even faster so it might be possible.
Note: I did say "at their fastest," in the situation I am talking about they really flew out of the gate. Most of the time they take longer because its harder to latch at such speeds.