Give stream of consciousness and then the final answer. Two trains are moving at 90 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) 42/5 sec\n(B) 45/8 sec\n(C) 40/6 sec\n(D) 37/6 sec\n(E) 42/4 sec
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70 + 90 = 150 * 5/18 = 400/9 mps\nD = 150 + 100 = 250 m\nT = 250 * 9/400 = 45/8 sec
The final answer: (B).
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