40 Kilometers per hour is equivalent to approximately What speed in MPH?
a. 15
b. 25
c. 40
d. 20
The Correct Answer and Explanation is :
40 kilometers per hour (km/h) is approximately 24.85 miles per hour (mph). To calculate this, we need to understand the conversion factor between kilometers and miles.
Conversion Formula:
To convert km/h to mph, the formula is:
[
\text{mph} = \text{km/h} \times 0.621371
]
The factor 0.621371 is derived from the fact that 1 kilometer is approximately 0.621371 miles. Let’s apply the formula:
[
40 \, \text{km/h} \times 0.621371 = 24.85484 \, \text{mph}
]
Answer:
So, 40 km/h is roughly 25 mph, making option b. 25 the correct answer.
Detailed Explanation:
Kilometers per hour and miles per hour are both units that measure speed. Km/h is commonly used in countries that use the metric system, while mph is more common in countries like the United States and the United Kingdom, which follow the imperial system.
1 kilometer is less than 1 mile because 1 mile is approximately 1.609 kilometers. So when converting km/h to mph, the number will be smaller due to the shorter length of a mile.
In practical terms, this means that if you are traveling at 40 km/h, your speed in miles per hour will be slightly lower. This conversion is helpful when driving in a country that uses a different speed measurement system or interpreting speed limits when traveling.
For a quick estimation, multiplying kilometers by 0.6 can give a rough conversion to miles, although using the exact factor of 0.621371 gives more accurate results.