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Gas mileage actually varies slightly with the driving speed of a car (as well as with highway vs. city driving). Suppose your car averages 28 miles per gallon on the highway if your
average speed is 53 miles per hour, and it averages 18 miles per gallon on the highway if your average speed is 74 miles per hour. Answer parts (a) and (b) below.
a. What is the driving time for a 2300-mile trip if you drive at an average speed of 53 miles per hour? What is the driving time at 74 miles per hour?
The driving time at 53 milles per hour is
hours.
(Type an integer or decimal rounded to two decimal places as needed.)
hours.
The driving time is at 74 miles per hour is
(Round to two decimal places as needed.)
TE
b. Assume a gasoline price of $4.57 per gallon. What is the gasoline cost for a 2300-mile trip if you drive at an average speed of 53 miles per hour? What is the gasoline cost at 74
miles per hour?
The gasoline cost at 53 miles per hour is $
(Round to two decimal places as needed.)
The gasoline cost at 74 miles per hour is $
(Round to two decimal places as needed.)