Consider a limousine that gets  m(v) =  (120 − 2v) 5  mpg at speed v (in mph), the chauffeur costs $15/h, and gas is $3.5/gal. Find the cost (in dollars) per mile at speed v. Find the cheapest driving speed (in mph). (Round your answer to two decimal places.)

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter26: Customary (english) Units Of Measure
Section: Chapter Questions
Problem 5A: The volume V of a cone with height h and diameter d is given by V=0.2618d2h . What is the volume of...
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Consider a limousine that gets 
m(v) = 
(120 − 2v)
5
 mpg at speed v (in mph), the chauffeur costs $15/h, and gas is $3.5/gal.
Find the cost (in dollars) per mile at speed v.
Find the cheapest driving speed (in mph). (Round your answer to two decimal places.)
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