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      Question

      What is the speed of the boat in still water?

      Statement I. The boat travels at the speed of 12 km/h upstream. Statement II. The boat travels at the speed of 18 km/h downstream. In each of the following questions, a question followed by two statements numbered I and II are given. You have to read both the statements and then Give answer
      A If the data given in statement I alone are sufficient to answer the question, whereas the data given in statement II alone are not sufficient to answer the question. Correct Answer Incorrect Answer
      B If the data given in statement II alone are sufficient to answer the question whereas the data given in statement I alone are not sufficient to answer the question. Correct Answer Incorrect Answer
      C If the data in either statement I alone or in statement II alone are sufficient to answer the question. Correct Answer Incorrect Answer
      D If the data in both the statements I and II are not sufficient to answer the question. Correct Answer Incorrect Answer
      E If the data given in both the statements I and II are necessary to answer the question. Correct Answer Incorrect Answer

      Solution

      From statement I x – a = 12 km/h……………………..(i) From statement II x + a = 18 km/h ……………………(ii) From eq. (i) and (ii), we get ∴ a = 3 km/h & x = 15kmph Hence, data given in both statements are necessary.

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