Two rooms in the top floor of a building are heated by the same heating system such that an internal temperature of +22 oC is maintained during a cold night when the ambient air temperature is -18 oC. The external surface temperature of the roof of room A was measured at +1 oC whilst that for room B was -1 oC. Which of the following applies? (A) Both roofs are equally well insulated. (B) Roof of room A is better insulated. (C) Roof of room B is better insulated. (D) It is not possible to determine which is better insulated

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