Multiple choice

Passage

Each of questions given below is followed by three Statements I, II and III. You have to study the questions and all the three statements given to decide whether any information provided in the statement(s) is/are redundant and can be dispensed with while answering the given question.

How much time will the train A take to cross another train B running in opposite direction. I. Train A crosses a signal pole in 6 s. II. Ratio of the speeds of trains A and B is 3: 2. III. Length of the two trains together is 500 m.

  1. Only I

  2. Only II

  3. Only III

  4. I and II

  5. The question cannot be answered even with the information in all the three statements.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

To find crossing time, we need: time = total length / relative speed. I gives speed of A (length/6). II gives speed ratio A:B = 3:2. III gives total length. But we need individual train lengths to use the speed ratio, or need actual speeds. With only total length and speed ratio, we cannot determine individual lengths. Therefore the question cannot be answered.

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