Multiple choice

What is the speed of the train? Statement I: The length of the train is 120 m. Statement II: The train crosses another 180 m long train in 4 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 gives only train length (120 m), insufficient without time. Statement II mentions crossing another 180 m train in 4 seconds, but lacks direction information (same or opposite direction) and speed of the other train. Combined, we still need the other train's speed or direction.

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