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      Question

      Two boats A and B start towards each other from two

      places, 648 km apart. Speed of the boat A and B in still water are 20 km/h and 16 km/h respectively. If A and B proceeds against and with the stream, respectively then after how much time will they meet?
      A 20 hours Correct Answer Incorrect Answer
      B 15 hours Correct Answer Incorrect Answer
      C 12 hours Correct Answer Incorrect Answer
      D 13 hours Correct Answer Incorrect Answer
      E 18 hours Correct Answer Incorrect Answer

      Solution

      Let the speed of stream be ‘x’ km/h and they meet after‘t’ hours According to question, Distance covered while going upstream + Distance covered while going downstream = Total distance covered. (20 - x)t + (16 + x)t = 648 20t + 16t = 648 36t = 648 t = 18 hours

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