A 53-kilogram mountain climber, starting from rest, climbs a vertical distance of 768 meter. At the top, she is again at rest. In the process, her body generates 4.4 × 106 Joule of energy via metabolic processes. In fact, her body acts like a heat engine, the efficiency of which is given by Equation 15.11 as e = |W|/|QH|, where |W| is the magnitude of the work she does and |QH| is the magnitude of the input heat. Calculate her efficiency as a heat engine.