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A hot body is kept in cooler surrounding...

A hot body is kept in cooler surroundings. Its rate of cooling is ` 3^(@)C`/min when its temperature is ` 60^(@)C and 1.5^(@)C`/ min when its temperature is ` 45^(@)C`. Determine the temperature of the surroundings and the rate of cooling when the temperature of the body is ` 40^(@)C`

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