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      Question

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

      speed of the boat is 15 km/hr. II. The boat rows up a river 30 km in 6 hours. Direction (Q.116-120): each of the questions given below has one question and two statements marked I and II. 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 data in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question. Correct Answer Incorrect Answer
      B If the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question. Correct Answer Incorrect Answer
      C If the data in both statement I and II together are required to answer the question. Correct Answer Incorrect Answer
      D If the data either in statement I alone or in statement II alone is sufficient to answer the question Correct Answer Incorrect Answer
      E if the data in both the statements I and II together are not sufficient to answer the question. Correct Answer Incorrect Answer

      Solution

      we know that speed = distance/Time From statement II Upstream speed = 30/6 = 5 km/hr From both I and II, Speed of boat = 1/2 (Downstream + upstream speed) 15 = 1/2 (downstream + 5) 30 = downstream +5 Downstream speed = 25 km/hr Therefore, both statement I and statement II together are necessary to answer the question.

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