Two trains are moving at 40 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) 41/2 sec\n(B) 5/2 sec\n(C) 61/2 sec\n(D) 71/6 sec\n(E) 49/6 sec Now, let's think a bit. Some random thoughts:
User
70 + 40 = 110 * 5/18 = 275/9mps\nD = 150 + 100 = 250 m\nT = 250 * 9/275 = 49/6 sec
The final answer: (E).
Assistant