A family is planning a vacation, traveling 300 miles from their house. If they plan to stop at parks to allow the children to play every two hours, how many parks will they visit before they reach their destination assuming they travel 60 mph?

I'm thinking 3 since they go to the park immediately to start the 2 hour period so

park 0hours 0miles park 2hr 120miles park 4h 240miles than for the rest of the 60 miles no park.​