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      Question

      Speed of a boat in still water is three times the speed

      of the boat in upstream. If the boat takes 48 minutes to cover 24 km in downstream, then find the speed of the boat in still water.
      A 15 km/h Correct Answer Incorrect Answer
      B 18 km/h Correct Answer Incorrect Answer
      C 17 km/h Correct Answer Incorrect Answer
      D 27 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let speed of the boat in still water be тАШ3xтАЩ km/h. Speed of the boat in upstream = 3x ├╖ 3 = тАШxтАЩ km/h Speed of the stream = 3x тАУ x = тАШ2xтАЩ km/h Speed of the boat in downstream = 3x + 2x = тАШ5xтАЩ km/h ATQ; (24/48) ├Ч 60 = 30 So, 5x = 30 Or, x = 6 So, speed of the boat in still water = 3 ├Ч 6 = 18 km/h

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