Multiple choice

Passage

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Directions: In the following question, you have to find out which of the following statements is/are redundant for determining the answer of the given question. What is the speed of boat in still water? Statements: I. The boat covers 12 km in 2 hr downstream. II. The boat covers the same distance in 4 hr upstream. III. The speed of the stream is one-third that of the boat in still water.

  1. Both I and II

  2. Either II or III

  3. Only III

  4. The question cannot be answered even with the information in all three statements

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let boat speed be B and stream speed be S. I: B+S = 12/2 = 6. II: B-S = 12/4 = 3. III: S = B/3. From I and II, 2B = 9, B = 4.5. From I and III, B + B/3 = 6 => 4B/3 = 6 => B = 4.5. From II and III, B - B/3 = 3 => 2B/3 = 3 => B = 4.5. Any two statements are sufficient to find B. Therefore, any one statement is redundant.

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