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      Question

      A boat goes 220 km downstream in 11 hours, and 135 km

      upstream in 15 hours. The speed of the stream is┬а┬а
      A 8.5 km/hr Correct Answer Incorrect Answer
      B 5.5 km/hr Correct Answer Incorrect Answer
      C 7.5 km/hr Correct Answer Incorrect Answer
      D 6.5 km/hr Correct Answer Incorrect Answer

      Solution

      Distance downstream= 220 km Time taken to row downstream = 11 hrs. therefore, speed downstream = 220/11 = 20 km/hr Distance upstream = 135 km Time taken to row upstream = 15 hrs therefore, speed upstream = 135/15 = 9 km/hr therefore, speed of the stream = 1/2 (20 - 9) = 5.5 km/hr

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