Diameter 7591

The pedal wheel on a bicycle has 28 teeth. The gear wheel on the rear wheel has 8 teeth. How many times does the rear wheel turn if we step on both feet 112 times? How many meters can we travel with it at least, and how much more if the rear wheel has a diameter of 80 cm?

Correct answer:

n =  196
s =  492.6 m

Step-by-step explanation:

$n=\frac{112}{2}\cdot \frac{28}{8}=\frac{112\cdot 28}{2\cdot 8}=\frac{3136}{16}=196$

$$\begin{gathered} D=80\text{cm}\to \text{m}=80:100\text{m}=0.8\text{m} \\ s=n\cdot \pi \cdot D=196\cdot 3.1416\cdot 0.8=492.6\text{m} \end{gathered}$$

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