A train running at the speed of 30 km/hr crosses a pole in 6 sec. What is the length of the train?
Pick:
A) 20 m
B) 70 m
C) 50 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 * 6 = 50 m answer : c"
Answer: C