Multiple choice

What is the speed of a train? (I) The train crosses a man in 10 seconds. (II) The train crosses a 300 metre long platform, which is equal to its length in 30 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
B Correct answer
Explanation

Statement II: Train crosses 300m platform (equal to its length) in 30s. So train length = 300m, total distance = 600m. Speed = 600/30 = 20 m/s. Statement I alone doesn't give length, so insufficient. Option B (II alone sufficient) is correct.

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