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      Question

      Two boats A and B start towards each other from two

      places, 500 km apart. Speed of the boat A and B in still water are 30 km/h and 20 km/h respectively. If A and B proceeds against and with the stream, respectively then after how much time will they meet?
      A 10 hours Correct Answer Incorrect Answer
      B 15 hours Correct Answer Incorrect Answer
      C 9 hours Correct Answer Incorrect Answer
      D 11 hours Correct Answer Incorrect Answer
      E 12 hours Correct Answer Incorrect Answer

      Solution

      Let the speed of stream be โ€˜xโ€™ km/h and they meet afterโ€˜tโ€™ hours According to question, Distance covered while going upstream + Distance covered while going downstream = Total distance covered. (30 - x)t + (20 + x)t = 500 30t + 20t = 500 50t = 500 t = 10 hours

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