74. Suppose your car averages 38 miles per gallon on the highway if your average speed is 55 miles per hour, and it averages 32 miles per gallon on the

highway if your average speed is 70 miles per hour. a. What is the driving time for a 2000-mile trip if you drive at an average speed of 55 miles per hour? 'What is the driving time at 70 miles per hour? b. Assume a gasoline price of $2.55 per gallon. What is the gasoline cost for a 2000-mile trip if you drive at an average speed of 55 miles per hour? What is the gasoline cost at 70 miles per hour?