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[" A beaker full of hot water is kept in...

[" A beaker full of hot water is kept in "],[" a room.If it cools from "],[80^(0)C" to "75^(0)C" in "t_(1)" minutes,from "],[75^(0)C" to "70^(0)C" in "t_(2)" minutes and "],[" from "70^(@)C" to "65^(@)C" in "t_(3)" minutes,"],[" then "]

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