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[" Certain quantity of water cools "],[" from "70^(@)C" to "60^(@)C" in the first "5],[" min and to "54^(@)C" in the next "5],[" min.The temperature of the "],[" surroundings is "],[" (a) "45^(@)C],[" (b) "20^(@)C],[" (c) "42^(@)C],[" (d) "10^(@)C]

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