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[" A solid iron rectangular block of dimensions "4.4m,2.6m," and "1m" is cast into a hollow cylindrical pipe of "],[" ternal radius "30cm" and thickness "5cm" .Find the length of the pipe.(Use "Pi=22/7" ) "],[" The cost of painting the total outside surface of a closed cylindrical oil tank at "60" paise per sq.dm is Rs."]

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