In what time will a railway train 20 m long moving at the rate of 36 kmph pass a telegraph post on its way?	Select the correct option
A) 6 sec B) 7 sec C) 8 sec D) 9 sec E) 2 sec

Rationale: "t = 60 / 36 * 18 / 5 = 2 sec answer : e"
Answer: E