Suki has a boat that averages 6 miles per gallon of gasoline, and the tank holds amp; gallons of gasoline. At 2 p.m., Suki left the dock at the marina. At 3 p.m., she was 8 miles east and 15 miles north of the dock. If she continues at this rate, which of the following represents how many more hours until the tank will be out of gasoline (rounded to the nearest tenth)?
1) 1.5 hours
2) 1.8 hours
3) 2.5 hours
4) 2.8 hours