Feat[]
http://ww3.cartooncrazy.net/watch/ben-10-ultimate-alien-episode-15-perplexahedron/ (02:22)
Calculation[]
The Perplexahedron was stated by Azmuth to be located in another galaxy. (01:56)
Aggregor flew to the Perplexahedron immediately after the events of the last episode, in which the protagonists fled Ledgerdomain, were contacted by Azmuth and talked to him for a little bit, and were then teleported to the Perplexahedron. So the timeframe for this is probably around 10 to 15 minutes.
Distance to the nearest galaxy - 2.3651826e+22 meters
Timeframe (Low-End) - 15 minutes
15 * 60 = 900s
Timeframe (High-End) - 10 minutes
10 * 60 = 600s
2.3651826e+22 / 900 = 2.627980666666666666667e+19 m/s or 87,659,999,327.49c
2.3651826e+22 / 600 = 3.941971e+19 m/s or 131,489,998,991.24c
Final Tally[]
Aggregor flies to the Perplexahedron (Low-End) - 87,659,999,327.49c
Aggregor flies to the Perplexahedron (High-End) - 131,489,998,991.24c