The diameter of a cycle wheel is 28 cm. How many revolutions will it make in moving 13.2 km?

Explanation

To solve the problem of how many revolutions a cycle wheel with a diameter of 28 cm will make while moving 13.2 km, we can follow these steps:

### Step 1: Convert the distance from kilometers to centimeters.
1. We know that 1 kilometer = 1000 meters and 1 meter = 100 centimeters.
2. Therefore, to convert kilometers to centimeters, we multiply by 100,000 (since 1 km = 1000 m = 100,000 cm).

\[
13.2 \text{ km} = 13.2 \times 1000 \times 100 = 13.2 \times 100,000 = 1,320,000 \text{ cm}
...