Multiple choice

Train A crosses a platform in 30 seconds. What is the speed of Train A? I. Train A crosses a 180 m. long train running in opposite direction in 36 seconds. II. The other train crosses a signal in 9 seconds.

  1. If statement I alone is sufficient but statement II alone is not sufficient.

  2. If statement II alone is sufficient but statement I alone is not sufficient.

  3. If each statement alone (either I or II) is sufficient.

  4. If statement I and II together are not sufficient.

  5. If both statements I and II together are sufficient, but neither statement alone is sufficient.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement I: Train A crosses 180m train in 36 seconds. But we don't know the other train's speed or Train A's length. Not sufficient. Statement II: Other train crosses a signal in 9 seconds. This gives the other train's length, but not Train A's details. Even together, we can't find Train A's speed because we don't know Train A's length from crossing a platform. Insufficient.

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