"p! Directions: Summer is here, and the Marcus family is planning a trip. Help them determine the total cost. . Getting there: The Marcus family is going to drive since airfare is quite expensive. Their family vehicle has an 18-gallon gas tank and can travel 30 miles on one gallon of gas. The trip is 870 miles, one way. How many miles do they travel there and back? 11740 • If they can travel 30 miles on one gallon of gas, and their family car has an 18-gallon tank, how many miles can they travel on one tank of gas? How many gallons of gas will their family need to travel the number of miles in the trip (round trip)?​