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[" (12) A body cools from "50^(@)C" to "...

[" (12) A body cools from "50^(@)C" to "40^(@)C" in "5min" .The "],[" surrounding temperature is "20^(@)C" .In what further "],[" time (in minute) will it cool to "30^(@)C" ? "],[[" (a) "5," (b) "(15)/(2)," (c) "(25)/(3)," (d) "10]]

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