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