A truck has a minimum speed of 15 mph in high gear. When traveling x mph, the truck burns diesel fuel at the rate of
0.0110469 ( 1156/x + x) gal/mile.
Assuming that the truck can not be driven over 54 mph and that diesel fuel costs $1.21 a gallon, find the steady speed that will minimize the total cost of the trip if the driver is paid $20 an hour.

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oh srry, didnt see the other one

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