Question

A certain bacterium swims with a speed of 3m/s. How long would it take this bacterium to swim across a petri dish having a diameter of 8 cm

Answer 1

Time = (distance) / (speed)

Distance = 8 cm  or  0.08 meter

Time = (0.08 meter) / (3 meter/sec)

Time = (0.08 meter) · (sec / 3 meter)

Time = (0.08 / 3) (meter-sec/meter)

Time = 0.027 second

Answer 2

The number of time it would take this bacterium to swim across a petri dish is equal to 0.0267 seconds.

Given the following data:

• Distance = 8 cm.  

• Speed = 3 m/s.

Conversion:

100 cm = 1 meter

8 cm = 0.08 meter

To determine the number of time it would take the bacterium to swim across a petri dish:

Speed can be defined as the distance covered by an object or organism per unit time and it is usually measured in meter per seconds (m/s).

Mathematically, speed is given by the formula;

$Speed = \frac{distance}{time}$

Making time the subject of formula, we have:

$Time = \frac{distance}{speed}$

Substituting the given parameters into the formula, we have;

$Time = \frac{0.08}{3}$

Time = 0.0267 seconds.

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