A) 25°C
B) 10°C
C) 15°C
D) 20°C
Correct Answer: B
Solution :
[b] By Newtons law of cooling |
where is the temperature of surrounding. |
Now, hot water cools from 60°C to 50°C in 10 minutes, .(i) |
Again, it cools from 50°C to 42°C in next 10 minutes. (ii) |
Dividing equations (i) by (ii) we get |
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