Question:The length of the longest rod that can be placed in a room `30` m long,`24` m broad and `18` m high, is : 

A `30 m` 
B `15√2 m` 
C `30√2 m` 
D `60 m` 

+ Answer
C 

+ Explanation
Length of longest rod = Length of diagonal 

`= √1^2 + b^2 + h^2`

`= √(30)^2 + (24)^2 + (18)^2`

`= √1800`

`= 30√2 m`.

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Irin Moni

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