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      Question

      Speed of current is 25% of speed of boat in still

      water, if boat travelled 45 km downstream and returned back in total 12 hr. then find speed of boat in still water?
      A 4km/hr Correct Answer Incorrect Answer
      B 8km/hr Correct Answer Incorrect Answer
      C 6km/hr Correct Answer Incorrect Answer
      D 10km/hr Correct Answer Incorrect Answer
      E 12km/hr Correct Answer Incorrect Answer

      Solution

      Speed of boat in still water : Speed of current = 100x : 25x => 4x : x According to question, => 45/(4x + x) + 45/(4x тАУ x) = 12 => (135 + 225)/15x = 12 => x = 360/180 = 2 Speed of boat in still water = 4 ├Ч 2 = 8 km/hr

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