A train running at the speed of 60 km/hr crosses a pole in 3 sec. What is the length of the train?  Choose the correct choice from the following choices:
A) 50 B) 75 C) 100 D) 120 E) 25

Rationale: "speed = 60 * 5 / 18 = 50 / 3 m / sec length of the train = speed * time = 50 / 3 * 3 = 50 m answer : a"
Answer: A