Question: Two trains are moving at 85 kmph and 70 kmph in opposite directions. Their lengths are 150 m and 100 m respectively. The time they will take to pass each other completely is?\nOptions:\n(A) 5 25/31 sec\n(B) 7 1/17 sec\n(C) 7 2/2 sec\n(D) 8 1/2 sec\n(E) 7 1/9 sec Random thoughts:
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70 + 85 = 155 * 5/18 = 775/18 mps\nD = 150 + 100 = 250 m\nT = 250 * 18/775 = 180/31 = 5 25/31 sec The final answer: (A).
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