Suppose the cost incurred in operating a cruise ship per hour is a+bv^33 dollars, where a and b are positive constants and v is the ship’s speed in miles per hour. At what speed should the ship be...

Suppose the cost incurred in operating a cruise ship per hour is a+bv^33 dollars, where a
and b are positive constants and v is the ship’s speed in miles per hour. At what speed
should the ship be operated between two ports (located d miles apart) to minimize the
cost?