Use some thinking to answer the following question. Two trains are moving at 50 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) 6 ½ sec\n(B) 9 ½ sec\n(C) 3 ½ sec\n(D) 7 ½ sec\n(E) 2 ½ sec
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\70 + 50 = 120 * 5/18 = 100/3 mps\nD = 150 + 100 = 250 m\nT = 250 * 3/100 = 15/2 = 7 ½ sec So the final answer is (D).
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