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      Question

      If the sum of upstream and downstream speed is 30 km/hr

      and the speed of the current is 5 km/hr. Then find time taken to cover 40 km in downward?
      A 2 hrs Correct Answer Incorrect Answer
      B 2.5 hrs Correct Answer Incorrect Answer
      C 3 hrs Correct Answer Incorrect Answer
      D 3.5 hrs Correct Answer Incorrect Answer
      E 4 hrs Correct Answer Incorrect Answer

      Solution

      Let the speed of boat in still water be x km/hr. According to the question, => x + 5 + x − 5 = 30 => x = 15 Downstream speed = 5 + 15 = 20 km/hr Required time = 40/20 = 2 hrs

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