A 70 kg runner loses 0.5 kg of water each hour through evaporation of perspiration in order to maintain a stable temperature. The latent heat of water at his skin temperature is 2440 kJ.kg−1 and the average specific heat capacity of his body is 3.5 kJ.kg−1.K−1. If he stopped perspiring, how much would his temperature rise in the following 30 minutes? Units: ºC Round off the answer to 1 decimal place.