[填空题]
A marathon runner has an average metabolism rate 0 pw ( oco:8w+uopso*soh:mx)of aboutn*ic +o( a(;zutdn1rb $950\,kcal/h$ during a race. If the runner has a mass of 55 kg, estimate how much water she would lose to evaporation from the skin for a race that lasts 2.5 h. kg