If a train, travelling at a speed of 18 kmph, crosses a pole in 5 sec, then the length of train is? Choose the correct choice from the following answers.
A) 281 m
B) 25 m
C) 50 m
D) 125 m
E) 75 m

Rationale: "b b = 18 * 5 / 18 * 5 = 25 m"
Answer: B