A Truck Gets 600/x Mpg When Driven at a Constant

question 131

Multiple Choice

A truck gets 600/x mpg when driven at a constant speed of x mph (between 40 and 80 mph) . If the price of fuel is $1/gallon and the driver is paid $8/hour, at what speed between 40 and 80 mph is it most economical to drive? ​

• A) 60 mph
• B) 80 mph
• C) 75 mph
• D) 40 mph
• E) 45 mph

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