Added classes:

src/Truck.java

@@ -0,0 +1,15 @@
+
+public class Truck extends CivilVehicle {
+
+    private final int TIME_TO_FIX = 20; //in minutes
+
+    public Truck(double vehicleSize){
+        super(vehicleSize);
+    }
+
+    public int getTimeToFix(){
+    	return TIME_TO_FIX; 
+    }
+
+
+}