Final answer:
To estimate what 50 kilometers per hour would be in miles per hour, multiply by the conversion factor of 1.61.
Step-by-step explanation:
To estimate what 50 kilometers per hour would be in miles per hour, Billy should consider the conversion factor between kilometers and miles. He should notice that 1 mile is approximately 1.61 kilometers. Therefore, to convert kilometers per hour to miles per hour, he can multiply the value in kilometers per hour by the conversion factor of 1.61.
For example, if Billy wants to convert 50 kilometers per hour to miles per hour, he can multiply 50 by 1.61 to get approximately 80.5 miles per hour. So, 50 kilometers per hour is approximately equal to 80.5 miles per hour.