In how many seconds will a train 150 meters long pass an oak tree, if the speed of the train is 36 km/hr? Choose the correct choice from the following answers:  A) 11  B) 13  C) 15  D) 17  E) 19

Rationale: "speed = 36 * 5 / 18 = 10 m / s time = 150 / 10 = 15 seconds the answer is c ."
Answer: C