In a specific type of heat exchanger, a very hot jet of air is cooled from 145 degrees centigrade to 100 degrees centigrade by a cold stream of water. The water temperature must not rise By more than 12 degrees centigrade. Find 1. How much cooling water in kg/s is required to cool 2.5 kg/s of air and 2. What the rate of heat transfer between the two fluids is.