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A certain bacterium swims with a constant speed of 4.61 µm/s. How long will it take to swim across a petri dish that has a diameter of 8.69 cm?

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d = V*t = 8.69*10^-2.
4.61*10^-6m/s * t = 8.69*10^-2.
t = 8.69*10^-2/4.61*10^-6 = 1.89*10^4 =
18900 s. = 5.25 h.

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