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 Think first, then make a decision. Some random thoughts:
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S = (200 + 300)/45 = 500/45 * 18/5 = 40 So the answer is (D).
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