How many seconds will a train 200 meters long running at the rate of 36kmph take to pass a certain telegraph post?	Choose the correct choice
A) 10 sec B) 20 sec C) 25 sec D) 30 sec E) 35 sec

Rationale: distance = length of train = 200 meters speed = 36 kmph = 36 * 5 / 18 = 10 m / s required time = 200 / 10 = 20 sec answer is b
Answer: B