i) The long-distance runner started on the course running at the average speed of six month. One half-hour later, the second runner started same course at the average speed of 7mph. How long after second runner started will first runner overtake first runner?
ii) On the 130 mi trip, the car traveled at the average speed of 18mph to the island. Average speed on way to airport was 100mph, and average speed returning was 150mph. Determine distance between two airports if total flying time was 5 h.