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      Question

      A boat sailor begins rowing from point X, moving against

      the stream for 30 minutes. After that, he turns around and rows with the stream for another 30 minutes, reaching point Y. Given that the distance between X and Y is 5 km, determine the speed of the stream.
      A 22 km/hour Correct Answer Incorrect Answer
      B 18 km/hour Correct Answer Incorrect Answer
      C 12 km/hour Correct Answer Incorrect Answer
      D 5 km/hour Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let, speed of boat in still water and stream be β€˜x’ km/hr and β€˜y’ km/hr, respectively. According to question, (x – y) Γ— (30/60) + 5 = (x + y) Γ— (30/60) 0.5(x + y – x + y) = 5 y = 5 km/hour

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