WBCS.LIVE practice question

The speed of a boat in still water is 10kmph. If it can travel 26km downstream and 14km upstream in the same time, then the speed of the stream is

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 2 kmph
  2. 2.5 kmph
  3. 3 kmph
  4. 4 kmph

Correct answer and explanation

Correct answer: 3 kmph

Explanation: āœ… Correct Answer: C. 3 kmph šŸ“š Explanation: Let the stream speed be 's'. Time downstream is 26 / (10+s) and time upstream is 14 / (10-s). Since times are equal, 26(10-s) = 14(10+s). Simplifying gives 260 - 26s = 140 + 14s, so 120 = 40s. Therefore, the speed of the stream is exactly 3 kmph.