Marathon runners stay cool by getting water at various "water stations" along the route.
A) Calculate the change in body temperature for a "standard man" associated with rapidly drinking 200 g of cold water at a temperature of 4 oC.
B) Instead of drinking the water, you could also dump the water on your skin and lose energy by evaporation. Calculate the change in body temperature by rapidly evaporating 50% of the water (100 g) from your skin. You can neglect the energy change associated with the change in temperature of the water - you only need to consider the evaporation.