'Override abstract class field

I have pretty basic question.

abstract class Vehicle{
int mileage;

Vehicle(this.mileage);
}

class Truck extends Vehicle{
String plateNumber;
@override
String mileage;

Truck(this.plateNumber, this.mileage);
}

How I can override mileage field from Vehicle class properly? I want to change the type of the field in my Truck class



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