A refrigerator door is 150 cm high, 80 c...

A refrigerator door is 150 cm high, 80 cm wide and 6 cm thick. If the coefficient of conductiviy is `0.0005 (cal)/(cm s^@C)` and the inner and outer surfaces are at `O^@C` and `30^@C` respectively, then what is the heat loss (in calories) per minute through the door?

900

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2700

3600

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