A train running at the speed of 60 km/hr crosses a pole in 30 sec. What is the length of the train?  Choose one:
A) 535 m  B) 178 m  C) 186 m  D) 168 m  E) 500 m

Rationale: "speed = 60 * 5 / 18 = 50 / 3 m / sec length of the train = speed * time = 50 / 3 * 30 = 500 m answer : e"
Answer: E