A train running at the speed of 30 km/hr crosses a pole in 9 sec. What is the length of the train?	Choose the most appropriate option.
A) 75 m
B) 180 m
C) 324 m
D) can not be determined
E) none of these

Rationale: "speed = 30 * 5 / 18 = 25 / 3 m / sec length of the train = speed * time = 25 / 3 * 9 = 75 m answer : a"
Answer: A