How fast is 315 km in mph?
Understand the Problem
The question is asking for the conversion of speed from kilometers per hour (km/h) to miles per hour (mph). This involves applying a conversion factor where 1 kilometer is approximately 0.621371 miles.
Answer
$62.14 \text{ mph}$
Answer for screen readers
The speed in miles per hour (mph) is approximately $62.14 \text{ mph}$.
Steps to Solve
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Identify the speed in km/h First, take the speed you want to convert from kilometers per hour (km/h). For example, let's assume the speed is $100 \text{ km/h}$.
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Apply the conversion factor To convert kilometers to miles, use the conversion factor $1 \text{ km} \approx 0.621371 \text{ miles}$. Multiply the speed in kilometers by this factor.
$$ \text{Speed in mph} = \text{Speed in km/h} \times 0.621371 $$
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Calculate the speed in mph Using the example speed, we have:
$$ \text{Speed in mph} = 100 \text{ km/h} \times 0.621371 $$
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Perform the calculation Now, calculate the value:
$$ \text{Speed in mph} \approx 100 \times 0.621371 \approx 62.1371 $$
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Round the result Finally, round the result to the desired number of decimal places, if necessary. In this case, rounding to two decimal places gives you:
$$ \text{Speed in mph} \approx 62.14 $$
The speed in miles per hour (mph) is approximately $62.14 \text{ mph}$.
More Information
The conversion factor used is derived from the relationship between kilometers and miles. Knowing this conversion is useful in various applications, including travel, vehicle speed, and sports.
Tips
- Forgetting the conversion factor: Make sure to always use the correct value for the conversion from kilometers to miles.
- Not multiplying: Sometimes, users incorrectly divide instead of multiplying when converting units.
- Rounding too early: If you round the answer too early in the calculation, you might lose accuracy. Wait until the final result before rounding.
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