It is given in the question that the area of the glass window of a room is and thickness is 2 mm, the outer and temperature is , and the inner temperature is . it is also given that the thermal conductivity of glass in S.I unit is 0.2. Then we have to find the heat flowing in the room per second.

We know that the heat flowing through the room per second is given by
Here, is representing the heat flowing in the room per second, A is the area of the glass window, K is the thermal conductivity of glass in S.I unit, is the temperature change, dx is the thickness of the glass window.
Here we will convert the thickness of the glass window into the meter. We know that we get-

The temperature change is given by outer temperature - inner temperature. We get-

On putting the values of in , we get-

Here the value of in L.H.S is one second, we get-

So, the flow of heat in the room per second will be .