Please answer the following question by reasoning step-by-step.
A train running at the speed of 60 km/hr crosses a pole in 21 sec. What is the length of the train?\nOptions:\n(A) 350\n(B) 150\n(C) 277\n(D) 258\n(E) 191

(A)
Speed = 60 * 5/18 = 50/3 m/sec\nLength of the train = speed * time = 50/3 * 21 = 350 m.

The final answer: (A)