Final answer:
The speed limit on interstate highways in the United States is approximately 60 miles per hour when converted from kilometers per hour using the conversion factor.
Explanation:
The order of magnitude for the speed limit of driving on interstate highways in the United States is around 60 miles per hour. To convert this from kilometers per hour to miles per hour, you can use the conversion factor that 1 mile is approximately equal to 1.609 kilometers.
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