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diff --git a/class-15-js-OOP/moumen-khadija/index.js b/class-15-js-OOP/moumen-khadija/index.js
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+// Add a static function compareSpeed that compares two cars and returns the object that is the faster car.
+// Change the speed setter so that it throws an error if the caller tries to make it greater than 300km/h.
+// Write a getter speedInKmSec that returns the speed in km/sec. It should use the speed in km/h.
+ 
+
+class Car {
+  // Part 1. Constructor (REVIEW)
+  constructor(color, fuelType) {
+    this.color = color;
+    this.fuelType = fuelType;
+    
+  }
+
+  // Method.
+  paint(newColor) {
+    return this.color = newColor;
+  }
+
+  // Part 2. Static methods.
+   hasTheSameProperties(car2){
+    return this.color === car2.color &&
+      this.fuelType === car2.fuelType
+  }
+
+  static hasTheSamePropertiesStatic(car1, car2) {
+    return car1.color === car2.color &&
+    car1.fuelType === car2.fuelType
+  }
+
+  // static method
+  static compareSpeed(car1,car2){
+    if( car1.speedKmH > car2.speedKmH){
+      return car1
+
+    }else {
+      return car2
+    }
+  }
+
+
+  // Part 3. Getter, setter.
+  get speedKmH() {
+    return this.speed
+  }
+
+  set speedKmH(newTopSpeedKmH) {
+    
+    
+    if (newTopSpeedKmH > 300){
+     console.log ("slow down")
+    }else {
+      return this.speed = newTopSpeedKmH;
+    }
+  }
+
+  get speedInMiles() {
+    return this.speed * 0.621371
+  }
+  get speedInHours(){
+    return this.speed / 3600
+  }
+}
+
+const audi = new Car("red","gas")
+const tesla = new Car('red', "electric")
+
+audi.paint('blue')
+
+audi.speedKmH = 200
+tesla.speedKmH = 100
+
+// we call getter without paranthies
+console.log(audi.speedInHours)
+
+
+//console.log(Car.compareSpeed(audi, tesla))
+
+
+// console.log(audi.hasTheSameProperties(tesla))
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