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      Question

      What is the speed of the stream? I. The boat

      covers a distance of 54 km in 3 hours while running downstream. II. The boat covers the same distance in 6 hours while running upstream. Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give answer –
      A If the question can be answered with the help of both the statements but not with the help of either statement itself Correct Answer Incorrect Answer
      B If the question cannot be answered even with the help of both the statements. Correct Answer Incorrect Answer
      C If the question can be answered with the help of statement II alone. Correct Answer Incorrect Answer
      D If the question can be answered with the help of statement I alone. Correct Answer Incorrect Answer
      E If the question can be answered with the help of either statement alone. Correct Answer Incorrect Answer

      Solution

      we know that speed = (Distance)/(Time) From statement I Downstream speed = (54/3) = 18 km/hr Upstream speed = (54/6) = 9 km/hr  Speed of stream = (1/2) (Downstream - upstream speed) = (1/2) (18 - 9) = 4.5 km/hr Therefore, both the statements are necessary to answer the question.

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