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      Question

      A boat covers 35 km downstream in 2 h and covers the

      same distance upstream in 7 h. Find the speed (in km/h) of the boat in still water.
      A 7 Correct Answer Incorrect Answer
      B 11.50 Correct Answer Incorrect Answer
      C 6.25 Correct Answer Incorrect Answer
      D 11.25 Correct Answer Incorrect Answer

      Solution

      speed of a boat downstream = 35/2=17.5km/h speed upstream =35/7=5km/h now the speed of the boat in still water = 17.5+5/2 =22.5/2=11.25km/h

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