Multiple choice

The following question has some statements. Study the question and the statements and decide which of the statement(s) is/are necessary to answer the question. How much time will train A take to cross another train B running in opposite direction? Statement 1: Train A crosses a pole in 7 seconds. Statement 2: Ratio of speed of trains A and B is 3:5 Statement 3: length of two trains together is 500m.

  1. Statement 1 and 2 together

  2. All statement are required

  3. Statement 2 and 1 or 3 together

  4. Only statement 1 is sufficient

  5. All statement are not sufficient
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

To find the time for train A to cross train B, we need the formula: time = (length of A + length of B) / (speed of A + speed of B). Statement 1 gives the relationship between length and speed of A only. Statement 2 gives only the ratio of speeds, not actual values. Statement 3 gives combined length but not individual lengths. None of these provide absolute values or complete information needed.

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