Posted by Anonymous on Sunday, January 20, 2013 at 11:31pm.
The total length traveled back and forth in one lap is 50 m + 50 m = 100 m. The swimmer swims 93 of these laps, so he travels a distance of 93*100 = 9,300 m. The total displacement of the swimmer is zero (he ends up in the same place where he started). The swimmer's average velocity is also zero, because he spends half the route going in a positive direction, and half in a negative direction. The swimmer's average speed is 9,300 m/ 4h
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