In how many seconds will a train 180 meters long pass an oak tree, if the speed of the train is 36 km/hr?	Choose one:
A) 14 B) 16 C) 18 D) 20 E) 22

Rationale: "speed = 36 * 5 / 18 = 10 m / s time = 180 / 10 = 18 seconds the answer is c ."
Answer: C