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.
__________ mph
Correct Answer:
Verified
Correct Answer:
Verified
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