A car is traveling at $55$ miles per hour. What is this speed approximately in $\mathrm{km}/h$?

• A. $2$ km/h
• B. $10$ km/h
• C. $30$ km/h
• D. $90$ km/h

Answer: (D)

Verified step by step guidance

1. Identify the given speed in miles per hour (mph), which is 55 mph in this problem.
2. Recall the conversion factor between miles and kilometers: 1 mile is approximately equal to 1.609 kilometers.
3. Set up the conversion by multiplying the speed in miles per hour by the conversion factor to convert miles to kilometers: \$55 \times 1.609$.
4. Since the time unit (hours) remains the same, the result of the multiplication will give the speed in kilometers per hour (km/h).
5. Perform the multiplication to find the approximate speed in km/h, which will be close to 90 km/h.