Use reasoning to answer the following question.
A train 210 m long, running with a speed of 63 km/hr will pass a tree in?\nOptions:\n(A) 15 sec\n(B) 16 sec\n(C) 18 sec\n(D) 12 sec\n(E) 25 sec

(D)
Speed = 63 * 5/18 = 35/2 m/sec\nTime taken = 210 * 2/35 = 12 sec.

Thus, the answer is (D)