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[" 74.In a room where the temperature is...

[" 74.In a room where the temperature is "30^(@)C" ,a body cools from "],[61^(@)C" to "59^(@)C" in "4" minutes.The time (in minutes) taken by the "],[" body to cool from "51^(@)C" to "49^(@)C" will be: "],[[" (a) "8," (b) "5," (c) "6," (d) "4]]

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