Question

There are 1,000 meters in a kilometer, and 3,600 seconds in an hour. You can convert units of meters per second (m/s) into kilometers per hour (km/h) by multiplying by 3,600 and dividing by 1,000. (Hint: That is the same thing as multiplying by 3.6.)

A. What is the speed of a cheetah in kilometers per hour?


B. What is the speed of a person in kilometers per hour?

Answer 1

To convert speeds from meters per second (m/s) to kilometers per hour (km/h), you can use the conversion factor of 3.6.

### A. Speed of a Cheetah
Cheetahs can reach speeds of around 30 m/s to 34 m/s. Let's use 30 m/s for calculation:

\[
\text{Speed in km/h} = \text{Speed in m/s} \times 3.6
\]
\[
\text{Speed in km/h} = 30 \, \text{m/s} \times 3.6 = 108 \, \text{km/h}
\]

### B. Speed of a Person
A typical running speed for an average person might be about 3 m/s.

Using the same conversion:

\[
\text{Speed in km/h} = 3 \, \text{m/s} \times 3.6 = 10.8 \, \text{km/h}
\]

### Summary
A. The speed of a cheetah is approximately **108 km/h**.

B. The speed of a person is approximately **10.8 km/h**.