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      Question

      The speed of a boat upstream is 10 km/hr. If it travels

      210 km downstream in 7 hours, what is the speed of the current?
      A 5 km/hr Correct Answer Incorrect Answer
      B 18 km/hr Correct Answer Incorrect Answer
      C 12 km/hr Correct Answer Incorrect Answer
      D 10 km/hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the speed of the current be ā€˜x’ km/hr Therefore, speed of the boat in still water = (x + 10) km/hr According to the question, (x + 10 + x) = 210/7 Or, 2x + 10 = 30 Or, 2x = 20 Or, x = 10 Therefore, speed of the current = 10 km/hr

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