英文数学题,求高手,急A truck gets 500/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 $17/hr, at what speed is it most economical for the truck
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英文数学题,求高手,急A truck gets 500/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 $17/hr, at what speed is it most economical for the truck
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