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## 2. Enable the distance travelled by different models on the test track to be compared
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Please add a method to the `RemoteControlCar` interface to encapsulate the behavior of the `getDistanceTravelled()` method for the two types of car.
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Please add a method to the `RemoteControlCar` interface to encapsulate the behavior of the `getDistanceTravelled()` method for the two types of car. Notice that the Experimental model has a different speed than the Production model.
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