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      Question

      Speed of a boat in still water to speed of boat in

      upstream is 9:7. If the boat can travel 440 km in downstream in 5 hours, then find the time taken by the boat to cover 18 km in still water.
      A 30 minutes Correct Answer Incorrect Answer
      B 20 minutes Correct Answer Incorrect Answer
      C 15 minutes Correct Answer Incorrect Answer
      D 18 minutes Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let speed of boat in still water and speed of boat in upstream be ‘9x’ km/h and ‘7x’ km/h, respectively. Speed of stream = 9x – 7x = 2x km/h Speed of boat in downstream = 9x + 2x = 11x km/h So, 11x = 440/5 = 88 Or, x = 8 Speed of boat in still water = 9 × 8 = 72 km/h Desired time = 18/72 = 15 minutes

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