Two liquid with masses m1=10kg and m2=20kg are thoroughly mixed. If there specific heats are C1=0.2cal/g -∘C and C2=0.1cal/g -∘C and their temperatures are 30∘C and 40∘C respectively, then the temperature of the mixture is
A
25∘C
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B
35∘C
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C
30∘C
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D
28∘C
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Solution
The correct option is B35∘C We know, Temperature of mixture Tmix=m1C1T1+m2C2T2m1C1+m2C2