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      Question

      A boat can travel 36 km upstream and 54 km downstream in

      9 hours. If the speed of the boat in still water is 3 times the speed of the stream, find the speed of the stream.
      A 4.5 Correct Answer Incorrect Answer
      B 3.5 Correct Answer Incorrect Answer
      C 7.2 Correct Answer Incorrect Answer
      D 12.5 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Speed Stream = x, Boat = 3x. U = 2x, D = 4x. 36/2x + 54/4x = 9 => 31.5/x = 9 => x = 3.5.

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