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Certain quantity of water cools from 70C to 60C in the first 5 minutes and to 54C in the next 5 minutes. The temperature

Certain quantity of water cools from 70C to 60C in the first 5 minutes and to 54C in the next 5 minutes. The temperature of the surroundings is: (a) 45C (c) 42C (b) 20C (d) 10C

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