Final answer:
To find the number of kilometers you can travel on $30, divide $30 by the cost per gallon of gasoline and multiply by the miles per gallon your car gets. Then convert the distance in miles to kilometers.
Step-by-step explanation:
To find the number of kilometers you can travel on $30, you need to first calculate how many gallons of gasoline you can buy with that amount of money. Since gasoline costs $3 per gallon, you can buy $30 / $3 = 10 gallons of gasoline.
Next, you need to multiply the number of gallons of gasoline by the number of miles per gallon your car gets. Your car gets 32 miles per gallon, so you can travel 10 gallons * 32 miles per gallon = 320 miles on 10 gallons of gasoline.
Finally, you need to convert the distance in miles to kilometers. Since 1 mile is equal to 1.60934 kilometers, you can travel 320 miles * 1.60934 kilometers per mile = 514.4368 kilometers on $30.
Therefore, the correct answer is A) 512 km.