A kg of 40°C water and a kg of 20°C water, after being mixed, have a temperature of 30°C. However, the final temperature of a 1-kg iron block at 40°C placed into 1 kg of water at 20°C is
A) less than 30°C.
B) at or about 30°C.
C) more than 30°C.
Answer: A
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