What is the length of the longest pole which can be kept in a room 12 m long, 5 m broad and 3 m high?  Choose the correct answer:
A) 7
B) 9
C) 11
D) 13.34
E) None
Explanation:   d2 = 122 + 52 + 32 = 13.34   13.34)
<result>D</result>
What is the length of the longest pole which can be kept in a room 12 m long, 5 m broad and 3 m high?