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      Question

      A man rows upstream 60 km and downstream 36 km taking

      12 hours each. Find the speed of current.          
      A 0.5 km/hr Correct Answer Incorrect Answer
      B 1 km/hr Correct Answer Incorrect Answer
      C 1.5 km/hr Correct Answer Incorrect Answer
      D 2.5 km/hr Correct Answer Incorrect Answer

      Solution

      Distance upstream= 60 km, time taken to row upstream = 12   hrs. Speed upstream = 60/12   = 5 km/hr. Distance downstream= 36 km, Time taken to row downstream = 12   hrs. Speed downstream =   36 /12   = 3 km/hr. Speed of the current = (5 – 3) * ½ = 1 kmph

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