Multiple choice

Directions: In this problem, a question is given followed by three statements numbered (I), (II) and (III). Read the statements carefully and determine which of them is/are sufficient/necessary to answer the question. Train A and train B are running parallel on two tracks. What is the sum of the lengths of both the trains? I. Train A crosses train B in 20 seconds. II. Length of train A is 80 m. III. Speed of train A is 36 kmph more than that of train B.

  1. Only statements I and II

  2. Only statements I and III

  3. None of the statements

  4. All three statements

  5. Any two statements
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To find the sum of the lengths (L1 + L2), we need the relative speed. Statement I gives the time taken to cross. Statement III provides the difference in speeds. We need the actual speeds or the sum of speeds to determine the distance covered (L1 + L2 = relative speed * time). Statements I and III are necessary to relate the lengths to the speeds.

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