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      Question

      Boat тАШAтАЩ covers 200 km in downstream in 10 hours. If

      the speed of stream is 2 km/hr then find the time taken by boat тАШAтАЩ to cover 160 km in upstream.
      A 12 hours Correct Answer Incorrect Answer
      B 15 hours Correct Answer Incorrect Answer
      C 10 hours Correct Answer Incorrect Answer
      D 17 hours Correct Answer Incorrect Answer

      Solution

      Downstream speed of boat тАШAтАЩ = 200/10 = 20 km/hr Speed of boat тАШAтАЩ in still water = 20 тАУ 2 = 18 km/hr Upstream speed of boat тАШAтАЩ = 18 тАУ 2 = 16 km/hr Time taken by boat тАШAтАЩ to cover 160 km in upstream = 160/16 = 10 hours

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