A drag racer finishes the 400 m trip from beginning to finish line in 10.0 seconds. He then slows to a stop in the other 5.0 seconds and is 200 m beyond the finish line. Lastly, he is towed back all along the track to the beginning line in 1 minute. Determine his average velocity for this complete round trip?
i) 10 m/s
ii) 40 m/s
iii) 16 m/s
iv) 0 m/s