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      Question

      Ratio of distance covered by boat in upstream to

      downstream is 4:3. Time taken in downstream and upstream is 2hr and 4 hr respectively. If speed of boat in still water is 15 km/hr then find speed of stream.
      A 2 km/hr Correct Answer Incorrect Answer
      B 3 km/hr Correct Answer Incorrect Answer
      C 5 km/hr Correct Answer Incorrect Answer
      D 6 km/hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let distance covered by boat in upstream and downstream be 4x and 3x km respectively. And speed of stream be y km/hr. ATQ, => 4x/(15 – y) = 4 => 4x + 4y = 60 ------ (i) => 3x/(15 + y) = 2 => 3x – 2y = 30 ------ (ii) Solving (i) and (ii), we get => x = 12, y = 3 km/hr Speed of stream = 3km/hr

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