Multiple choice

Passage

In each of the following questions, a question & then two statements – I & II are given. You have to determine that the data provided in these statements is enough to answer the question or not. Study both the statement:

Two trains, running in the opposite direction cross each other in 15 sec. What is the difference between their lengths? Statement I: The difference between their speeds is 12 m/sec Statement II: The sum of their speeds is 28 meters per second.

  1. Only Statement I alone.

  2. Only Statement II alone.

  3. Both Statements I and II together.

  4. Neither Statement I nor II is sufficient.

  5. Either Statement I or II.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement I: Difference of speeds = 12 m/s. We need relative speed (sum) for crossing time, not difference. Not sufficient. Statement II: Sum of speeds = 28 m/s. This gives total length = 15 × 28 = 420 m, but not the difference of individual lengths. Not sufficient. Together: We still cannot determine individual lengths or their difference. Neither statement alone or together is sufficient (option D).

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