A nuclear power plant generates $900$ MW; the reactor temperature is $315\backslash$deg C and a river with a water temperature of $20\backslash$deg C is available.

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 $165$ m$3$s$1?$

The rate at which heat must be discarded to the river is

MW$.$

The temperature rise of the river is

K$.$