the length and breadth of a room are 3m and 4m. What is the length of the longest metallic rod that can be placed on the floor?

5m

Explanation:

The longest metallic rod can be placed diagonally on the floor

Thus we need to find the length of the diagonal of the room

Formula for diagonal = root of (length squared + breadth squared)

=V16 + 9

=V25

=5m

Therefore the longest rod is of 5m

5m

Explanation:

The diagonal of the room is 5m which is the longest part of the room