If the weight of 13 meters long rod is 13.4 kg. What is the weight of 6 meters long rod ?  Choose the correct choice
A) 7.2 kg .  B) 10.8 kg .  C) 12.4 kg .  D) 6.18 kg  E) none

Rationale: answer ∵ weight of 13 m long rod = 13.4 kg ∴ weight of 1 m long rod = 13.4 / 13 kg ∴ weight of 6 m long rod = 13.4 x 6 / 13 = 6.18 kg option : d
Answer: D