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R, and its velocity were to become proportional to its size, how speedy would it go? E. coli is about 1 ?.. extended and swims at about two mm/min. This equals 120 mm/h or 0.12 meters/h. A vehicle is about 5 meters in length and moves at about 65 mph, or 100 km/h, maximally about 250 km/h. The size difference is hence 5 ?106. 0.12 meters/h x 5 ?106 = 0.6 ?106 meters/h = 600 km/h. Not terrible for