Posted by Parsa on Monday, March 12, 2012 at 5:02am.
The temperature difference is initially 65-18 = 47 degrees. To reach equilibrium, the 20 l of hot water only has to drop in temerature half as much (15.7 C) as the 10 l of cold water has to rise (31.3 C). The final equilibrium temp is 49.3 C.
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