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The average cost of flying a customer in an airplane trip between two cities can be modeled by the function

`C(x)=200+(x)/(20)+(27000)/(x)`

where

`x`

stands for the airplane's speed in miles per hour (

`m(i)/(h)r`

), and

`C(x)`

represents the cost in dollars. Use a graphing utility to answer the following question. Round to two decimal places if needed and include units in your answers. To obtain a minimum cost per passenger of , the airplane should fly at