Find the speed v, in miles per hour, that will minimize costs on a 115-mile delivery trip. The cost per hour for fuel is C dollars, and the driver is paid W dollars per hour. (Assume there are no costs other than wages and fuel. Round your answer to one decimal place.)

Fuel cost: C = (v^2/240)

Driver: W = $18.90

I am a bit confused about this question and I ve done all the steps right but cant get the right answer

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