A pipe can fill a tank in x hours and another pipe can empty it in y (y > x) hours. If both pipes are open, in how many hours will the tank is filled?

• ক xy/(x - y) hours.
• খ (x - y) hours.
• গ (x + y) hours.
• ঘ xy/(y - x) hours. ✅ সঠিক উত্তর