Multiple choice

A train crosses another train coming from the opposite direction in 9 seconds. If the length of the trains is 100m then what is the speed of the train? (I) The train passes a platform in 14 seconds. (II) The speed of the other train is 90 km/hour. (III) The other train passes a pole in 6 seconds.

  1. Only II

  2. Only III

  3. Only I

  4. Either I & II or II & III

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

The question lacks the speed of the first train. Statement II gives other train's speed (90 km/h), and III gives its length (from pole time), allowing us to find both trains' speeds and lengths to solve. Statement I alone is insufficient. Either II & III together (with the crossing time) is sufficient, or I & II together. Since no single option says II & III, E is correct.

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