The cost of fuel used in propelling a dirigible varies as the square of its speed and is $100/hour when the speed is 100 miles/hour. Other expenses amount to $200/hour. Find the most economical speed for a voyage of 1,400 miles.

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The Answer of The cost of fuel used in propelling a dirigible varies as the square of its speed and is $100/hour when the speed is 100 miles/hour. Other expenses amount to $200/hour. Find the most economical speed for a voyage of 1,400 miles.

The Cost of Fuel Used in Propelling a Dirigible Varies