Multiple choice

Directions: The question given below is followed by some information given in three statements I, II and III. You have to consider the information in all the three statements and decide the information in which statement is not required to answer the question and therefore, can be dispensed with. What will be the speed of the boat in still water? I. The boat covers 24 km in 4 hours in downstream. II. In still water, the speed of the boat is thrice the speed of the stream. III. The boat covers 24 km in 8 hours in upstream.

  1. Either I or II

  2. Either II or III

  3. Either I or III

  4. Any one statement

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

To find the speed of the boat in still water (b) and stream (s), we need both downstream (b+s) and upstream (b-s) speeds. Statement I gives b+s, and Statement III gives b-s. Statement II is redundant because b and s can be found using I and III alone.

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