The length of the longest rod that can be placed in a room which is $12 m$ long, $8 m$ broad and $9 m$ high is

27 m

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19 m

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17 m

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13 m

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Solution

The correct option is C $17 m$
Length of the longest rod
$=$ Diagonal of the room
$= \sqrt{12^{2} + 9^{2} + 8^{2}}$
$= \sqrt{289} = 17$ m

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