Convert 80 km to miles per hour.
Understand the Problem
The question is asking for a conversion of speed from kilometers per hour to miles per hour. To solve this, we will use the conversion factor where 1 kilometer is approximately equal to 0.621371 miles.
Answer
To convert a speed $k$ km/h to mph, use the formula: $\text{Speed in mph} = k \times 0.621371$.
Answer for screen readers
The final answer will depend on the specific value of $k$ you start with. For example, if $k = 100$, then the speed in miles per hour is:
$$ \text{mph} = 100 \times 0.621371 = 62.1371 $$
Steps to Solve
- Identify the given speed in kilometers per hour
Let's say the speed in kilometers per hour is denoted as $k$.
- Apply the conversion factor
To convert kilometers per hour to miles per hour, multiply the speed in kilometers by the conversion factor:
$$ \text{Speed in mph} = k \times 0.621371 $$
- Calculate the speed in miles per hour
Now, substitute the value of $k$ (the speed in km/h) into the equation you formed in step 2 and calculate the result.
The final answer will depend on the specific value of $k$ you start with. For example, if $k = 100$, then the speed in miles per hour is:
$$ \text{mph} = 100 \times 0.621371 = 62.1371 $$
More Information
This conversion is useful for understanding speed in different countries. Many countries use kilometers per hour, while others, like the United States, primarily use miles per hour.
Tips
- Failing to multiply by the correct conversion factor. Always check that you’re using $0.621371$ when converting from kilometers to miles.
- Confusing kilometers with miles. Ensure you know which unit you're starting with before applying the conversion.
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