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OpenStudy (anonymous):
The cost of fuel used by a particular boat varies directly as the cube of the speed of the boat. It costs $2.50/h when the speed is 5 km/h. If you want to rent this boat, it costs $40/h plus fuel cost. What is the most economical speed for a voyage of 90 km? What is the minimum cost?
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OpenStudy (anonymous):
A Mathematica solution including a plot, is attached.
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