What is the speed of the current ?
I. A man can swim a distance of 9 kms. In 1 1 2 hrs. down streams.
II. While coming back up streams it takes him 3 hours to cover the same distance

if the data in statement I alone is sufficient to answer the question, while the data in statement II alone is not sufficient to answer the question

if the data in statement II alone is sufficient to answer the question, while the data in statement I alone is not sufficient to answer the question

if the data either in statement I alone or in statement II alone is sufficient to answer the question.

if the data in both the statements I and II together are not sufficient to answer the question.

if the data in both the statements I and II together are necessary to answer the question.

Answer : Option E

Explanation :

If the rate of swimming in still water be x kmph and speed of stream be y kmph,

then from statement I,

$x + y = frac{9}{{frac{3}{2}}} = 6$ kmph .....(i)

From statement II,

x – y = $frac{9}{3} = 3$ kmph ……(ii)

Clearly, both statements I and II are required to find the value of y.

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