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      Question

      Speed of a boat along the stream and against the stream

      is 20 km/hr and 18 km/hr respectively. What is the speed of the boat in still water?
      A 17 km/hr Correct Answer Incorrect Answer
      B 12 km/hr Correct Answer Incorrect Answer
      C 19 km/hr Correct Answer Incorrect Answer
      D 15 km/hr Correct Answer Incorrect Answer

      Solution

        ATQ, Let the speed of the boat in still water = b Let the speed of the stream = w ⇒ b + w = 20     ----eq.(1) Also, b - w = 18     ----eq.(2) Adding eq.1 and eq.2 ⇒ 2b = 38 ⇒ b = 19

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