Multiple choice

What is the speed of the train? I. The train crosses a signal pole in 13 sec. II. The train crosses a platform of length 250 m in 27 seconds. III. The train crosses another train running in the same direction in 32 seconds.

  1. I and II only

  2. I and III only

  3. II and III only

  4. Any two of the three

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

Let L = train length, s = speed. From I: L = 13s. From II: L + 250 = 27s. Combining: 13s + 250 = 27s, so 14s = 250, s = 125/7 ≈ 17.86 m/s. Statements I and II together are sufficient. Statement III mentions another train but doesn't give its length or speed, so it's insufficient alone or with only one other statement.

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