Multiple choice

Passage

Each of these questions consists of a question followed by informations in three statements. You have to study the question and the statements and decide that information in which of the statement(s) is/are necessary to answer the question.

What is the length of platform? I. Train crosses a platform in 24 seconds. II. Train crosses a man moving at the speed of 5 km/h in opposite direction in 12 seconds. III. Train crosses a pole in 14.4 seconds.

  1. I and II together

  2. II and III together

  3. All three together

  4. All together are not sufficient

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement I: L = 24 × (train speed) - train length (insufficient alone). Statement II: (train speed + 5 km/h) × 12 = train length (insufficient alone). Statement III: L = 14.4 × train speed (gives L in terms of speed). Combining all three: From III, train length L = 14.4v. Substituting in I and II gives two equations to solve for both v and L. Thus all three together are sufficient (Option C).

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