In a high school, 20% of the students own a supercharged Greased Lightning 409 car while the other 80% own a feeble Milquetoast car. Last year the students owning a 409 received 60 speeding tickets while the students owning a Milquetoast received 10 speeding tickets. That means that a student owning a 409 was k times more likely to receive a ticket than a student owning a Milquetoast. What is the value of k?