Multiple choice

Which information are necessary to answer the questions asked- At what time will the train reach point X from point Y? I. The train crosses another train of equal length of 250 m in 25 sec. running opposite direction. II. The train of 250 m crosses a signal pole in 10 sec. III. The distance between point X and point Y is 360 km.

  1. None of these

  2. II and III together are sufficient

  3. III and (I or II are sufficient)

  4. All three together are sufficient

  5. All three together are not sufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Time = Distance / Speed. From II: Train's speed = 250m / 10s = 25 m/s. From III: Distance = 360 km = 360000 m. Time = 360000 / 25 = 14400s = 4 hours. Statement I about relative speed is unnecessary.

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