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      Question

      A boy can swim a certain distance downstream in 2 hours

      and return in 3 hours. If the rate of stream is 4 kmph then what is the speed of boy in still water? TYPE 6
      A 11 kmph Correct Answer Incorrect Answer
      B 20 kmph Correct Answer Incorrect Answer
      C 17 kmph Correct Answer Incorrect Answer
      D 19 kmph Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the speed of the boy in still water be x kmph. Then, (x + 4) × 2 = (x – 4) × 3 => 2x + 8 = 3x - 12 => x = 20 kmph

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