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Write the definition of a function named timeOnHighway that receives three parameters, all of type double: mileEndingPoint, mileStartingPoint, and speed. The first two parameters indicate the mile markers on an interstate at which a vehicle goes to and starts at; the third parameter indicates the speed of the vehicle in miles per hour. The function returns the number of hours it takes a vehicle to go from the starting mile marker to the ending one. The function has a default value for the speed: 55 miles per hour, and a default value for mileStartingPoint: 0.0.