A Truck Gets 400/x Mpg When Driven at a Constant

question 100

Short Answer

A truck gets 400/x mpg when driven at a constant speed of x mph (between 40 and 70 mph). If the price of fuel is $1/gallon and the driver is paid $6/hour, at what speed between 40 and 70 mph is it most economical to drive? Round your answer to the nearest whole number.
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__________ mph

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Definitions:

Age

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individuals who have a natural preference for waking up early and are more alert and effective in the morning hours.