Multiple choice

What is the speed of the train? I. It crosses a pole in 10 seconds. II. It crosses a 200m platform in 20 seconds

  1. I alone

  2. II alone

  3. Both I And II

  4. Either I OR II

  5. Neither
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let speed be v and length be L. Statement I gives L = v * 10. Statement II gives L + 200 = v * 20. With two equations and two variables, the speed can be determined.

AI explanation

Let the train length be L and the speed be S, then the first statement establishes the equation L equals 10 times S. The second statement gives the equation L plus 200 equals 20 times S, which is a system of two independent linear equations. Solving these two equations simultaneously provides unique values for both variables, so both statements are required.

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