Use some thinking to answer the following question. Two trains are moving at 50 kmph and 70 kmph in opposite directions. Their lengths are 170 m and 100 m respectively. The time they will take to pass each other completely is?\nOptions:\n(A) 3 sec\n(B) 8 sec\n(C) 9 sec\n(D) 5 sec\n(E) 7 sec
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70 + 50 = 120 * 5/18 = 100/3 mps\nD = 170 + 100 = 270 m\nT = 270 * 3/100 = 8 sec So the final answer is (B).
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