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      Question

      A man swims downstream 60 km and upstream 36 km, taking

      12 hr each time. Find the man’s rate in still water?   
      A 3 km/hr Correct Answer Incorrect Answer
      B 2.5 km/hr Correct Answer Incorrect Answer
      C 5 km/hr Correct Answer Incorrect Answer
      D 4 km/hr Correct Answer Incorrect Answer

      Solution

      Speed downstream = 60/12 = 5 km/hr Speed upstream = 36/12  =   3 km/hr Man’s rate in still water= (5 + 3) x ½ = 4 kmph

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