Question

Gas mileage actually varies slightly with the driving speed of a car (as well as with highway vs. city driving). Suppose your car averages 31 miles per gallon on the highway if your average speed is 54 miles per hour, and it averages 29 miles per gallon on the highway if your average speed is 69 miles per hour. Answer parts (a) and (b) below. a. What is the driving time for a 3000-mile trip if you drive at an average speed of 54 miles per hour? What is the driving time at 69 miles per hour? The driving time at 54 miles per hour is hours. (Type an integer or decimal rounded to two decimal places as needed.) The driving time is at 69 miles per hour is hours. (Round to two decimal places as needed.) b. Assume a gasoline price of $3.64 per gallon. What is the gasoline cost for a 3000-mile trip if you drive at an average speed of 54 miles per hour? What is the gasoline cost at 69 miles per hour? The gasoline cost at 54 miles per hour is $ (Round to two decimal places as needed.) The gasoline cost at 69 miles per hour is $. (Round to two decimal places as needed.) Enter your answer in each of the answer boxes.

Answer 1

Solution : everage speed everage mileage su mile /hour 31 mile / gallon mile / gallon 99 69 mile /hour 3000 mile (a) terip distance total distance everage speed total time total time = V total distance everage speed. su mile/hour lo when. speed total distance hour = driving time 54 3000 55.56 hour 54 when speed 69 mile /hour total distance hour driving time 69 3000 43.48 hour 69

(10) = speed mileage given 69 mile hour mine / gallo - 29 n to tal miles covered gallon gasoline used - 29 3000 = = 103.45 gallon 29 line gasoline cost gasoline used & gasol cost per gallon (103. 3.45*3.64) 376.56 $