Multiple choice

What is the speed of a train? (I) The train crossing a platform double its length in 48 sec. (II) The length of the train is 360 m. (III) The train crosses a man in 16 sec.

  1. Only I

  2. Only II

  3. Either I & II together or I & III together

  4. Only III

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

Neither statement combination is sufficient. I+III alone fails (2 equations, 3 unknowns: speed, train length, platform length). II+III gives speed = 360/16 = 22.5 m/s, but without I we can't verify against the platform condition. The question asks 'What is speed?' - all options are incorrect as some data exists but none are sufficient.

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