Bank Math Master১টি পরীক্ষায় এসেছেপ্রশ্ন ১৮A 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?কxy/(x - y) hoursখ(x - y) hoursগxy/(y - x) hoursঘNone of the aboveউত্তর দেখুন