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I believe this is right but double check to make sure :)
Answer:
Speed in km/hr will be 109.412 km/hr
Explanation:
We have given speed of the car on a highway = 68 mi/hr
We have to find the speed in km/hr
For this first we have to change mi to km
We know that 1 mile = 1.609 km
Speed is the ratio of distance and time
So 68 mi/hr
So the speed in km/hr will be 109.412 km /hr
The answer is 1.07 x 10^9 km/hr. Hope I was able to help.