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August 28, 2015

Homework Help: Applied Calculus

Posted by Jacob on Friday, March 15, 2013 at 1:02pm.

A truck gets
800/x miles per gallon (mpg) when driven at a constant speed of x mph, where
40 ≤ x ≤ 80.
If the price of fuel is $2.80/gal and the driver is paid $19/hr, at what speed is it most economical for the trucker to drive? (Round your answer to two decimal places.)

I have no idea how I should set this problem up.

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