import java.util.ArrayList; public class Race { private Car currentLeader; private final int durationHours = 24; public static final int minimumSpeed = 0; public static final int maximumSpeed = 250; public Car evaluateLeader(Car car) { if (currentLeader == null) { currentLeader = car; } else if (durationHours * car.speed > durationHours * currentLeader.speed) { currentLeader = car; } return currentLeader; } }