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
Answer: D
Mathematics
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