While baking cookies, you make some terrible assumptions. You erroneously assume that the heat to your cookies is transferred exclusively through the aluminum cookie sheet (with a thermal conductivity of 205 ). You also erroneously assume that the total amount of heat transferred is all that matters for a good cookie. But let's take this poor assumptions and go with them. The recipe tells you to spread the room temperature (20) cookies into 0.9 cm diameter disks and bake them for 22 minutes at 197 C. You are impatient and bake your 3.1 cm diameter cookies at 280 C. Assume the cookies are 5 mm thick both in the recipe and in your impatient adaptation. After how many seconds should you take your cookies out of the oven