Multiple choice

What is the length of the slower train? I. The faster train of length 100 m takes 10 seconds to pass a man sitting in the slower train. II. The speed of the faster train is 80 km/hr.

  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 both statement together are sufficient, but neither statement alone is sufficient.

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

  5. If statement I and II together are not sufficient.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

To find the slower train's length, we need either its own length or speed, or the relative speed and time data. Statement I gives time (10 seconds) but not relative speed - we know the faster train's speed but not whether the slower train is moving or stationary. Statement II gives only the faster train's speed (80 km/hr). Even together, we don't know if the man is stationary or moving with the slower train, nor do we know the slower train's speed or length. The information is insufficient.

Keep practicing — related questions