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    • Question

      A man rows upstream 54 km and downstream 30 km taking 6

      hours each. Find the man’s speed in still water.       
      A 7.5 km/hr Correct Answer Incorrect Answer
      B 7 km/hr Correct Answer Incorrect Answer
      C 10 km/hr Correct Answer Incorrect Answer
      D 8.5 km/hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Distance upstream= 54 km, time taken to row upstream = 6 hrs. Speed upstream = 54/6 = 9 km/hr. Distance downstream= 30 km, Time taken to row downstream = 6 hrs. Speed downstream =   30/6 = 5 km/hr. Man’s rate in still water = (9 + 5) * ½ = 7 kmph

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