A train 200 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is?\nOptions:\n(A) 10\n(B) 20\n(C) 30\n(D) 40\n(E) 50
Please answer the following question by reasoning step-by-step.
(D)
S = (200 + 300)/45 = 500/45 * 18/5 = 40.

The answer: (D)