In how many seconds will a train 150 meters long pass an oak tree, if the speed of the train is 54 km/hr? Select the correct option:
A) 6  B) 8  C) 10  D) 12  E) 14

Rationale: "speed = 54 * 5 / 18 = 15 m / s time = 150 / 15 = 10 seconds the answer is c ."
Answer: C