Hi! So this is the scenario. I have 27 litres of water at 100 degrees Celsius. I have to cool the water to 20 degrees Celsius within 5 minutes. Since the heater power required is too high, I thought this could be done by adding in water at 20 degrees Celsius while draining out the water at 100 degrees Celsius simultaneously. I need to decide on the following: flow rate of cool water in, flow rate of hot water out while making sure the water cools to 20 degrees within the 5 minutes. I have no idea which formulae can help me out here. Can anyone please advise which formulae can be used?