A nuclear power plant generates 750MW; the reactor temperature is 315C and a river with a water temperature of 20C is available. (a) What is the maximum possible thermal efficiency of the plant, and what is the minimum rate at which heat must be discarded to the river? (b) If the actual thermal efficiency of the plant is 60% of the maximum, at what rate must heat be discarded to the river, and what is the temperature rise of the river if it has a flow rate of 165m3s1