Assume all temperatures to be exact.

A large window measures 1.7 m by 3.2 m.

Part A.) At what rate will heat be conducted through the window when the room temperature is 19°C and the outside temperature is -5 °C if the window consists of a single pane of glass 4.4 mm thick. (Assume that there is a constant temperature difference and consider conduction only.)

Express your answer using two significant figures.

Part B.) At what rate will heat be conducted through the window when the room temperature is 19°C and the outside temperature is -5 °C if the window instead has a double pane of glass (a "thermopane"), in which each pane is 2.0 mm  thick, with an intervening air space of 1.5 mm? (Assume that there is a constant temperature difference and consider conduction only.)

Express your answer using two significant figures.