Discussion Forum



Each of the questions given below consists of two statements numbered I and II given below it. Please read the questions carefully and decide whether the data provided in the statement(s) is / are sufficient to answer the given question.

1)

What the speed of the man in still water?

I. The man can swim a distance of $48$ kms in $6$ hours with upstream.

II. The man can swim the same distance in $4$ hours with downstream.


A) I alone sufficient while II alone not sufficient to answer

B) II alone sufficient while I alone not sufficient to answer

C) Either I or II alone sufficient to answer

D) Both I and II are not sufficient to answer

E) Both I and II are necessary to answer

Answer:

Option E

Explanation:

I. Speed upstream $=\frac{48}{6}$ km/hr $=8$ km/hr.

II. Speed downstream $=\frac{48}{4}$ km/hr $=12$ km/hr.

Speed of the boat $=\frac{1}{2}(8+12)$ km/hr $=10$ km/hr.

Thus, I and II together give the answer.

$\therefore$ Correct answer is (E).