Question

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

Answer 1

length of the room = 3m
breadth of the room = 4m
diagonal =
$3 {}^{2} + 4 {}^{2} = 25 \\ \sqrt{25 =} 5$
5m rod can be kept