#17-18: Mario's car has a 16-gallon tank. He left for a four-day round trip. Day 2: He left at 6:50 AM and arrived at 2:05 PM after driving 348 miles. What was his average speed in miles per hour? When he left, he had a full tank of gas. At the end of the day, it took 14.5 gallons to refill his tank. How many miles per gallon did he get?
