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      Question

      The speed of current is 30 km/hr. If the speed of the

      boat in still water had been 13 km/hr more than the original speed then it would take 7.5 hours to cover 420 km in downstream. Find the original speed of the boat in still water (in km/h).
      A 12 Correct Answer Incorrect Answer
      B 15 Correct Answer Incorrect Answer
      C 13 Correct Answer Incorrect Answer
      D 14 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the speed of the boat in still water be β€˜x’ km/hr According to the question, (x + 13 + 30) = 420/7.5 Or, x = 56 – 43 = 13

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